⑴Now paper waste is a big problem in schools. Many students throw away paper before they make full use of it.

⑵Most people choose to spend their weekends on the beach. But they often leave the rubbish on the beach.

⑶Each year there are an increasing number of cars on the road. As a result, the air pollution caused by cars is becoming more and more serious.

⑷The problem of wasting electricity is common. People leave lights, the TV and other electrical products on even when they don't use them.

⑸Most people waste water badly. They usually have a long-time shower and leave the water running when they wash things.

A. To stop the world from being polluted by cars, we have to make some changes. For example, we can go out by bus or by underground.

B. You can call on some students to clean the parks in your city. It's also a good idea to put up some "No Littering" signs in the parks.

C. Always keep in mind that electricity should be cut off before you leave. You'll not only save money but also save energy by doing so.

D. Here are two pieces of advice on how to save water in our daily life. Don't leave the tap(水龙头) on when washing or brushing. Take a short shower instead of a long one.

E. The rubbish on the beach can be swept into the sea. And all kinds of rubbish will put animals in the sea in danger. Always collect rubbish on the beach and never throw rubbish into the sea.

F. Saving paper is a good way to save trees and protect the earth. Students should use both sides of paper. They should also form the habit of sorting(整理) the rubbish so that the waste paper can be recycled.

G. Saving forests also helps a lot. Forests are useful. Please stop cutting them down and plant more trees and plants every year. Make our world a green one to live in.