—Why not? The singer is quite celebrated and popular.

—I doubt it.

    You have probably heard the expression, "It's raining cats and dogs outside." It means that it's raining very hard but not that 1 cats and dogs are filling from the sky. 2, one day in June, 1882, it really did rain 3 over Dubuque, Iowa. The frogs began falling along with hailstones (冰雹) during a 4 storm.

    Hail is 5 when drops of rainwater are caught by heavy winds and are carried high up into the air. There the raindrops become 6. Many drops may freeze together to form 7 of ice; these ice balls, or hailstones, then 8 to earth.

    During the storm in Dubuque, the strong winds 9 small frogs from nearby ponds into the air along with raindrops. When some of these frogs became covered 10 ice, both hailstones and "frog-stones" fell onto the ground.

    My friend's grandfather came to America from a farm in Thailand. After arriving in New York, he went into a cafeteria in Manhattan to get something to eat. He sat down at an empty table and waited for someone to take his order. Of course nobody did. Finally, a woman with a big plate full of food came up to him. She sat down opposite him and told him how a cafeteria worked.

    "Start out at that end," she said, "Just go along the line and choose what you want. At the other end they'll tell you how much you have to pay."

    "I soon learned that's how everything works in America," the grandfather told my friend later," Life's a cafeteria here. You can get anything you want as long as you want to pay the price. You can even get success but you'll never get it if you wait for someone to bring it to you. You have to get up and get it yourself."

    People across the world need to get moving, according to a new study by the World Health Organization (WHO).

    About 25 percent of adults do not get enough exercise, according to the study. This figure hasn't changed from 2001. Because of this, about 1. 4 billion people are at greater risk for deadly diseases such as heart disease and cancer.

    People should do at least 150 minutes of "moderate intensity (中等强度)" exercise each week, such as dancing or swimming. They can also do 75 minutes of "vigorous intensity (高强度)" activity, such as running or playing soccer, according to the WHO.

    As for how to exercise more, experts suggest we don't have to go to the gym every time, the Guardian noted. For example, we can go up and down stairs a lot instead of taking the lift. If we don't feel we can go to a dancing class each week, standing on one leg for 30 seconds a day is very good too.

    The study also found that women are less active than men, with 32 percent of women failing to exercise enough, compared to 23 percent of men. Women tend to spend more time at home taking care of children and doing housework, Time magazine noted.

    Countries with higher incomes (收入) showed higher rates (率) of inactivity. For example, people in Kuwait and the United States exercise less than people in Uganda and Nepal. This is partly because in developed areas, desk jobs have taken the place of manual labor (体力劳动).

    Some students can't sleep well the day before a math exam. Others may feel very nervous during the exam itself. But there might be a way to make the subject less stressful.

    "For people who are worried about math, posture (姿势) makes a big difference." Erik Peper from San Francisco State University told the Daily Mail. That's right-sitting up straight can help you do better on math exams.

    Scientists tested 125 college students. They asked them to do a simple math test while sitting in a slumped-over (趴倒的) position, or sitting up straight. After the test, 56 percent of students said the exam was easier to do if they were sitting up straight.

    Slumping over is a defensive posture. It can trigger (激发) negative (消极的) memories in the body and brain. This can stop you from thinking clearly, Peper said.

    Students who were not nervous about taking the math exam did not necessarily benefit from better posture. But they did find that doing math in a slumped-over position was more difficult, Science Daily reported.

    Good posture isn't just helpful for taking math exams. Athletes, musicians and public speakers can all benefit from better postures. When you feel stressed out, you can also try to sit up straight or stand tall. It can help you feel more positive and do better.

    Pat McGee noticed her daughter hadn't returned to the dentist's waiting room just before her surgery (外科手术). She walked to the bathroom and found Jessica McDaniels, 32, in there, crying.

    McGee took her daughter into her arms, "We're going to say 'goodbye' to the old Jessica," she said. "And 'hi' to the new Jessica."

    McDaniels, from St. Louis, US, had been wishing for this day since high school, when the bullying (霸凌) about her teeth started. Now that it was finally happening, she was worried and afraid.

    It was a social media post two months ago that got her there. Someone posted a photo of McDaniels with a comment about her overbite (龅牙). The post was shared many times, with many people making unkind comments on her appearance.

    The bullies didn't know the road McDaniels had traveled. She had nine operations on her ears from age 2 to 12 years old. She was almost deaf in her right ear. Her adult teeth didn't start coming in until she was 11 or 12, and doctors couldn't figure out why they were pushed outward. It got worse as she got older. McDaniels had been trying for years to get her teeth fixed, but it was always too costly.

    When her story got out, dentists wanted to help her. One of them, Maryann Udy, got in contact with McDaniels and offered her a new smile - free of charge. McDaniels wasn't sure at first, so she called her mother. The mother told her that Udy was her angel. "You need to do it," she told her daughter.

    The surgery was long and complicated (复杂的). It took weeks for the swelling (肿块) to go down, and several more months before McDaniels' new smile was ready. Later that year, she looked at her old photos online and smiled. "I loved her," she said. "She's thankful to be in less pain, to be on the way to a new smile. Sometimes, though, it feels like something is missing from who she was." Still, she loves taking selfies and admiring her new appearance. "I looked good before," she said. "I look even better now."

    Mr. Clark works in a middle school. He likes reading and often borrows some books        the library. He listens to the radio every morning and reads all kinds of        (newspaper) after supper. So he knows much and teaches well. His students like        (his) very much. Mike, Mr. Clark's little son, is only nine. He also likes books. And he often asks his father some questions. Mr. Clark always thinks the boy is too young        (understand) them and chooses the easiest ones to answer. Of course the boy is not pleased with it.

    One day, Mike read something about the lights and was        (interest) in it. When his father told him to do some housework, he went on thinking of it. He asked Mr. Clark a few questions, and his father answered all. Then his father said        (proud), "Fathers always know more        sons do!"

    The boy thought for        while and said, "I don't think so."

    "Oh? Why?"

    Mike didn't answer but asked a question instead, "Who        (invent) the lights?" "Thomas Edison." answered Mr. Clark.

    "Why didn't his father invent them?"        (look) at his son, Mr. Clark didn't know how to answer the question!

参考词汇：be addicted to沉溺; set a good example树立好榜样; parent-child relationship亲子关系; accompany陪伴

Dear parents,

    Nowadays, many of you