—He _______ for nearly twenty years.

—That's right. What's worse, the price of oil has increased ________ 60 percent.

—He asked Maria _______.

—OK!

—I _______ it on the desk when I came in.

—Sorry. I went out just now.

—For about five years. But it still looks quite new.

—Yes. The factory stops _______ now.

—_______. We don't have the same topic.

—Yes, at _______ it's _______ the one you bought for me.

Good morning, ladies and gentlemen,

    Today, I am very happy to have a meeting with you. At the meeting we will talk about the 1 we have these days. We all know the problems 2 and the objects falling from windows are getting worse. We have 3 lots of letters about such problems. So 4is time for us to look for possible ways to work out these problems.

    Some dog owners don't 5 their dogs well enough, and they let their dogs make mess on roads and in gardens. This makes the environment 6. I would like to tell the dog owners  7 their behavior is too bad, and at the same time they are 8 people feel unhappy. We should keep the environment 9.

    It is reported that some people 10 rubbish out of the windows. It is dangerous because falling objects 11 hurt others. It is against the law. We should put up a notice to teach people not to do so. If it is found, we will record the 12 and addresses of those people who throw objects. Then, a warning will be given and 13 will be punished by law.

    A safe and comfortable living environment is important to us. 14 we try our best to care for our community, it will be a good place to 15 in. Thank you for your coming.

A

    Air pollution is one of the most common types of pollution in the world nowadays. It is quite serious in many places, especially in big cities. It can do great harm to our environment such as making the earth warmer, causing acid rain or destroying the ozone layer. As for human beings, air pollution causes all kinds of breathing problems.

    There are several reasons for air pollution. Firstly, many cities have a lot of factories and there we need to make food, clothing and other things. Every year these factories pour millions of tons of smog into air. Secondly, power factories can also give out harmful air. For example, in 1986 there was a bad accident at a nuclear power station in Russia. A cloud of radiation crossed the whole Europe. It is said that 125,000 people died in Russia as a result of illnesses caused by this accident. Thirdly, there are more cars in cities now. Once they are out in the streets, they will take in fresh air and give out dirty gas. Besides, smoking cigarettes also makes air pollution worse as will as damaging(损害) our health.  

B

    All over the world in the twenty-first century, people can get new energy in many ways.

    Energy from the wind. People use the power of the wind．It is a clean source(来源) of energy, and there is lots of it. However, if the wind does not blow, there is no wind energy.

    Energy from the water. When water moves from a high place to a lower place, it has the power to make electricity. Waterpower produces enough energy for 40, 000 people in a town. Waterpower gives energy without pollution. However, people have to build dams(大坝) to use this energy, and building dams is very expensive.

    Energy from the earth. There is heat in the rocks under the earth. Scientists use the heat to make geothermal(地热的) energy. San Francisco gets half of the energy from geothermal power. This kind of energy is cheap, but it is only possible in a few places in the world.

    Energy from the sun. Solar panels(太阳能电池板) on the roofs of houses and buildings can turn energy from the sun into electricity. These panels can create enough energy to heat the whole house during winter. Solar power is clean and plentiful(丰富的), but when the weather is bad, it can't produce power．

C

    Waste can be seen everywhere in the school. Some students ask for more food than they can eat and others often forget to turn off the lights when they leave the classroom. They say they can afford these things. But I don't agree with them.

    Waste can bring a lot of problems. Although China is rich in some resources, we are short of others, for example, fresh water. It is reported that we will have no coal or oil to use in 100 years. So if we go on wasting our resources, what can we use in the future and where can we move? Think about it. I think we should say no to the students who waste things every day. Everybody should stop wasting as soon as possible.

    In our everyday life, we can do many things to prevent waste from happening, for example, turn off the water taps when we finish washing, turn off the lights when we leave the classroom, try not to order more food than we need, and so on. Little by little, everything will be changed. Waste can be stopped one day, if we do our best.

A: Hello, Kate! You look so happy. What happened?

B: Hi, Paul. I've got good news for us!

A: What is it?

B: Our teacher said she        take us to go on a school trip tomorrow.

A: Really? Where shall we go?

B: To the lake in the south of our town.

A: Oh, no. That's not a good place for a school trip.

B: Why do you say that?

A: Because the water in the lake        terrible. I went there last weekend.

B: I can        believe it. It used to be a beautiful place with flowers and grass, and the water in the lake was very       .

A: But now everything has changed. There is only rubbish       .

B: How terrible! Let's tell our teacher about it.

A: OK. Let's go.

提示：1、你周围的环境受到了哪些污染？2、它们都造成了什么后果？3、我们应该如何解决这些环境污染问题？