1. Cleaners collected waste paper or bottles for __________. (recycle)

2. There are all kinds of books on those __________ in the library. (shelf)

3. The __________ trees we plant, the better. (much)

4. “Please help __________ to some fish.” Mother said to the twins. (you)

5. Everyone should make a contribution to __________ (protect) our environment.

6. My aunt works in a __________ factory. (shoe)

7. We should do something to make our country much __________ __________. (beautiful)

8. Lucy is a __________ girl. She does everything __________. (care)

9. The children are very __________. They are playing __________ in the  park. (happy)

10. My mother loves to keep all the windows __________ at night. (close)

补全对话。从方框中选出适当的句子补全对话。

A: Lucy, why are you going out   1 ?

B: That’s the sound of a truck collecting rubbish.

A: Do you mean you have to take the rubbish to the truck?

B: Yes. You know   2  is our duty. We should help protect the environment.

A: I agree.  3 , we must do something around the neighbourhood.

B: Sure. It is our duty to keep the environment clean and tidy. If we make a contribution to protecting the environment,  4 

A: That’s right. We mush try our best to make our country more beautiful. So we should   5  to improve the environment.