1.(　　 ) Emily spent about three hours_______ her homework.

A. doing　　 B. do　　 C. to do　　 D. does

　 Mike: I hear you (1)_________ t o the Caribbean for a long holiday! Lucky you! But aren’t you (2)_______ the dangers of such long flights on the environment?

Ken: Why should I be worried?

Mike: Planes cause (3)___________.

Ken: I know, but what can I do about it? I already try my best to protect the environment.I recycle,I don’t just (4)_____________ things if I don’t want them any more. I (5)___________ the lights when I leave a room. Don’t tell me we shouldn’t travel by plane any more!

Mike:No,of course not.But there is something we can do about it. Have you (6)__________? It’s an environmental group that helps to (7)_____________trees. By planting more trees,We can help keep the air clean, because trees (8)_______the environment.　In this way, we can reduce the dangers of pollution.

Ken:Good! So I can enjoy my holiday,and when I come back, I’ll (9)________!

Mike: That’s the idea! Maybe we can all (10)_________ and start a small forest!

10. It’s better ___________(use) a plastic box and a china cup.

9. Some of the world’s greatest books _________________(write) long ago.

8. Some of the books _________________(make) into films.

7.The situation is __________. We can’t do anything about it.(hope)

6. People’s action makes a ___________ to the environment. ( different)

5. __________ something means using it again and again. (use)

4. You try ___________(not buy) too many things from abroad.

3. Everyone thinks about pollution and _____________(recycling).