The planet Mars is the closest and most similar planet to Earth. It is very      to scientists. For example, Mars has seasons with      weather, but other planets have the same temperatures all year round. Was there      on Mars?

    To find out, scientists need      if Mars ever had water. In 2004. two robot explores (探测器), or 'rovers', called Spirit and Opportunity were sent to look for      of water. These rovers can drive over rocks      all kind of rough ground. They can also use cameras and send photos       to Earth. First, the two rovers found chemicals and patterns (图文) in the rocks that were probably made by water. Then, they moved to another area and      other rocks which may have been created by water. Now scientists think there was probably water on the planet long ago. Today        are still not sure if there was life on the mars. They      need more information to decide. The discoveries of the two rovers answered some old questions, but they also brought up many new ones.

    The British Museum is the biggest one in the world. Inside, you feel smaller than usual. There are about a hundred things in the museum to see:       which have been telling the time for six hundred years, Roman money, some of the earliest books in the world, including Shakespeare's own works...

    The British Museum was set up nearly 300 years ago by a doctor, Sir Hans

Sloane. The man liked to       such things as books, drawings, clothes, money, animals, flowers, and also hoped that his things would be well       and so visited by people after his death.

    His wish came true, and the museum opened in 1759, six years after Sir Hans Sloane died.

    Later, more antiques (古董) arrived at the museum, more books, old and new, came to it, and more people wanted to visit it. The museum had a famous round Reading Room. There was      unusual in the room. Cool air came up      mall holes in the tables. Hot air flowing under   the floor kept readers' feet      . Since its opening, many famous men have written and studied there, like Karl Marx. And the library is growing faster and faster — there are four kilometers of new shelves each year,      it attracts increasing number of tourists each year.

    It is now open every day of the year, except for two holidays (New Year's Day and Christmas).

    Entrance (入场) is free. There are lots of special exhibitions and every day there are different films and talks, some of       for children. Small machines tell you about the museum and as you walk around it, you can look and listen at the same time. So if you are one of the British Museum's two      visitors this year, don't try to see it all too      . There is a lifetime of looking in the British Museum.

    Wang Ping is a cleaner. He has        in a park for 5 years. He is also a good father. Nothing can make him       than playing with his little daughter in his free time.

    Last Tuesday afternoon, while he was       the park, suddenly, he heard a woman crying for help. He ran up       to see what happened. The woman's 15-month-old baby girl choked (窒息) on a small piece of pear and her face       purple. The baby was too young to save herself, and the mother was so nervous that she didn't know how to save her daughter properly. Luckily, Wang Ping knew what to do. He took the baby in his        without thinking twice. With the mother's help, Wang Ping held the baby upside down and gave her a few pats (轻拍) on the back. After a short while, he succeeded in getting the piece of pear out of her mouth, and the baby began to cry. Her mom was so thankful because her daughter was      .

    Wang Ping tried his best and saved the        life. In his mind, helping others is just helping       . He hoped more people could        to help the people in need if possible.

    As the       goes, smiling is sunshine in everyone's heart. When I started to go to primary school, my teacher, Mr Wei told me the importance of smiling. He told me that       was a simple behavior which was very powerful. It can give people warm feelings, show your respect to       Since a smile is a positive (积极的) attitude, we can often smile to ourselves to become       and happy. Although there are some situations where we may experience hardship or even       , we can always smile to ourselves. It can help us       many difficulties as well as succeed in the end. Learning to        to others is also beneficial. When we smile to others, we can get a smile in      . Then it can put us in a good mood. What's more, it can also help us build a good relationship with others. In one word, smiling is a       which can understand us better. Therefore, let's start to smile and live a better and       life.

    Research show that successful learners have some good habits in common.

    Good learners often connect what they need to learn with something      . Studies show that if you are interested in something, your brain is more       and it is also easier for you to pay attention to it for a long time. For example, if they need to learn English and they like music or sports, they can       to English songs or watch sports programs in English.

    Good learners think about what they       good at and what they need to practice more. Even if you learn something well, you will forget it       you use it. “Practice makes perfect.” Good learners will keep practicing what they have learned, and they are not afraid of making      .

    Good learners usually choose the best way of the following methods when they study. For example, they may take notes by writing down       words or by drawing mind maps. They also look for ways to review what they have learned. They may do this by explaining the information to      .

    Good learners often ask questions during or after class. They even ask each other and try to find out the answers. Knowledge       from questioning.

Learning is lifelong journey because every day brings something new. Everything that you learn becomes a part of you and changes you, so learn       and learn well.

    In November 1979, pupils in England were able to watch a new TV program called Monkey.

    Most of them were hearing this story for the       time. However, this story is not new to Chinese children. The Monkey King or Sun Wukong is the main character in the       Chinese book Journey to the West.

    The Monkey King is not just any normal monkey. In fact, be sometimes does not       look like a monkey! This is because he can make 72 changes to his shape and size, turning himself into different       and objects. But       he can hide his tail, he cannot turn himself into a man.

    To fight bad people, the Monkey King       a magic stick. Sometimes he can make the stick so small that he can keep it in       ear. At other times, he is able to make it big and long.

    The Monkey King has       the children of China for many years. And as soon as the TV program       out more than 30 years ago, Western children became interested in        this story because the clever Monkey King keeps fighting to help the weak and never gives up.

    Once, two lazy birds lived in a nest together.       a cold winter day, a strong wind was blowing. Suddenly, there appeared a hole in their nest. The cold wind blew in through the hole and got away the warm air from the nest. They started feeling      . But each of them thought that the other bird would       the hole. As a result, no one did it. Soon the snow started to fall and         the nest. The two lazy birds felt freezing. But no one was active       to work. In the morning they were found dead in their nest.

    Life is the same. Some people never get       because their laziness blows out the chances. Being not lazy will enable you to live a happy and successful life. It's up to you.

    Once upon a time there was a man called Yue Yangzi in Henan who had a       wife.

    One day, Yue picked up a piece of gold. Gladly, he rushed hack home to show it to his wife.       , his wife said, " I hear that a good man doesn't drink the water of Dao Spring (盗泉) and wouldn't pick up the things others lost. He would rather die       food given by the people who disrespect him." Yue was very ashamed after hearing wife's words and       the gold off into the fields and went to study in a far place.

    One year later, Yue came back home. His wife asked him the       for his return.

    Yue said, "I was homesick and miss you very much."

    Hearing this, his wife took up a pair of scissors and walked to the loom (织布机), saying,

    "To make cloth, I weave (织) the cloth with one after       silk thread inch by inch. If I cut the cloth with the scissors, all my efforts are        Studying is also like this. You should get knowledge every day       stopping." 

    Yue Yangzi was       moved by his wife's words. Then he went back to his studies. This story reminds us       to give up halfway.

    In today's world, sleep experts often say that for a better night's rest, Americans should turn        their smart phones or iPads before sleeping. Such electronic products make the brain more       , and then influence their sleep. But according to a latest survey, more than 90% of Americans regularly use a computer or some other       of electronic products in the hour before bed.

    Researchers find that man-made light from some electronic products at night may reduce(减少) the brain chemicals that help       . In the study, the researchers let volunteers read, play games and watch movies on a screen for different time while measuring       much light their eyes received. They found that two hours of       before a bright screen at night reduced the sleep chemical levels by about 22%.

    Then the researchers studied the college students        often used computers at night. They got the        results. And researchers say that may not only cause sleeplessness, but also        the risk of obesity(肥胖症), diabetes(糖尿病) and other diseases.

    To be on the safe side, the researchers suggest that we should use computers        than before, or turn down our screens as much as possible before sleeping.

    One day, a father and his son went to a kite flying festival. When they arrived, there were already many adults and their children playing in the park. When the son saw the sky filled with        kites in different shapes, he was excited and wanted to get one too. His father agreed to buy one for him. So they went to a kite shop and        a beautiful one.

    With the string(线)in hand, the son started        the kite. Soon, the kite was high up in the sky. After a while, the son said, "Father, it seems that the string is stopping the kite from flying higher. If we cut it, it will be free and fly even higher. Can we cut it?” The father didn't reply, but just cut the string off the reel(线轴). Suddenly, the kite began to go       , which made the son much happier.

    However, to his surprise, the kite was coming down. They waited for quite some time.       , it fell onto the grass. The son felt upset and asked, "I thought that after cutting the string, the kite would fly higher. Why did it fall down?”

    The father smiled and said, “The role of the string was not stopping the kite from flying higher,        helping it stay in the sky, because the kite        can' t fly up. By using the string you help the kite go up in the right       . When you cut the string, it could not support the kite.

    In our life, we may sometimes feel like there are certain things that are holding us back and stopping us from growing. But in fact, these might be the things that support us      . We can really grow up and become stronger by realizing the        of these things.

    Li Wen is a 16-year-old boy. He works hard and        well in school. It is hard to believe that he had much        in school. His parents moved to the city to look for jobs,        they couldn't be at home to look        him. From then on, he became less interested in        to school and missed classes. Then his parents made a        to send him to a boarding school. He was shy and had no friends. Life there was difficult for him. One day he told his teacher he wanted to        the school. His teacher called his parents and        them to come back and talk with their son in person. Then his parents came back and had a talk with him. This communication changed his life. He realized that his parents would always love him and they would be        of everything good that he did. Now he is much        and more outgoing than he used to be.

    At the beginning of 2018, President Xi Jinping went to visit Liangshan before the Spring Festival. Xi       his greetings for Happy New Year. There were many impressive and touching things       his visiting Liangshan.

    Xi visited Sanhe and Huopu villages,       are in Zhaojue country in Liangshan. It's two        ride from Xichang to the villages. When he arrived at Sanhe village, he was warmly welcomed by the villagers. He walked into a family to understand the situation of the family. He said: I have been caring about Yi people. I'm very glad       you are living a good life and hope that all the villagers can live a happy life in the future Xi and the villagers sat in a circle in the family and chatted like a family. They talked and laughed very happily. He gave them       ways to become rich, healthy and happy.

    News of President Xi's coming       spread throughout the village, all the villagers in national costume rushed to greet warmly to      . Xi wore charwa to shook       with the villagers and said goodbye. All the villagers were singing a Yi folk song, “The flowers are waiting in the mountains, the nice wine is waiting, dear friend, please stay, stay…” Tears of great       came to the villagers' eyes as they sang the moving song.

    On the day of the interview, I got up at 6:00 in the morning. I got to the interview place without       breakfast. I was the 16^th interviewer(应聘者) and the       was a short ordinary-looking girl. I nodded to her. I asked her where she graduated. “I didn't graduate from a famous college,” She told me       a low voice.

    I didn't expect the interview would last so long. As I didn't have breakfast, my stomachache come to me. I had to sit by the table for a rest. Just at that time, the girl came and asked me what happened. I told her, “I didn't have       this morning, so I had a stomachache.”

    After a while, a worker came in and       me a bottle of milk and a piece of bread. It was certain that they were bought by the girl. I felt warm all over my heart because I hadn't imagined she would be so nice to help me–her rival(竞争对手).

          , I got the job. The first day I went to work, I was       to see the girl there. She also got the job. Later I asked her why she got the job. She said with a smile. “That day when I bought you the food and came back, an interviewer saw me and asked       I took the food in hands. I told him the       . Then I got the job.” At that moment, I came to know that when the girl helped me and the interviewer, she also helped       .

    Helping others will benefit yourself as well.

    Pan Jianwei, " Father of quantum (量子) " , was born in Zhejiang in March 1970. After he       at the University of Science and Technology of China from 1985 to 1995, Pan went to Vienna in 1996 for further studies and stayed there until 2001. Then he returned to the Chinese university as a physics professor and began to build a quantum science research team at the university. The team now includes about 50        , most of whom are also returnees  from overseas(海归) .

    He became a member of the Chinese Academy of Sciences ( 中 科 院 ) in 2011. Of all the members, he was the        one. In 2015, he was named the standing vice - president of the University of Science and Technology of China.

    Under his leadership, the world's first quantum satellite(卫星) was launched(发射)       in August 2016.

    Pan Jianwei was recognized by Nature magazine on        list of "10 people who mattered" in 2017.