One day I 1._______ one of my friends in a big town. Suddenly, a piece of beautiful music came to my ears. My friend’s father quickly 2._______　some bags of litter and went outside. I asked my friend, “What’s going on?” My friend said that there was a truck　3._______ litter outside.

“Whenever someone throws some litter in, it gives out beautiful music.

4._______ other people hear it, they’ll go out with their litter and throw it in.”

“It’s a　5._______ way to help keep our city clean,” said my friend.

5.　　 Drinking polluted water is not healthy.

　　 Drinking polluted water _______ _______.

4.　　 We all hope that the project will be a success.

　　 We all hope that the project will _______ _______.

3.　　 You know these papers can be used again.

You know these papers can _______ _______.

2.　　 It is full of hope for the team to win the match.

　　 It _______ _______ for the team to win the match.

1.　　 It is not possible to clean up the river in two days.

　　 _______ _______ to clean up the river in two days.

15. Health is very important to us. We should eat more vegetables and fruit ____ too much rich food.

A. instead of　 B. instead　 C. replace　 D. stand for

11-15 BBACA

14. Do you think it is ____ to throw away glass, metal and paper?

A. important　 B. necessary　 C. wasteful　 D. impolite

13. They are ____ advertisements everywhere.

A. putting up　 B. putting on　 C. setting up　 D. working out

12. ____ a language in possible situation is the best way to learn it.

A. Use　 B. Using　 C. Used　 D. Useful