21. The girl _____ her handbag on the bus when she got off it.

　　 A. forget　 B. left　　 C. lost　　 D. missed

20. I have been to the factory many times _____ five years ago.

　　 A. for　　 B. before　　 C. since　 D. in

19. He doesn’t drive as _____ as he did two years ago.

　　 A. careful　 B. carefully　 C. more carefully　 　D. good

18. The train _____ for ten minutes.

　　 A. has been away　 B. has gone　 C. has left　 D. has come

17. _______ our environment is our duty.

　　 A. Take care　 B. Taking care of　 　C. Take care for　 D. Taking care with

16. We are going to make a contribution to ______ our country when we grow up.

　　 A. build　　 B. building　　 C. will build　　 D. make

15.- Have you seen _____ pen?　 I left it here this morning.

　　　 - Is it _____ black one? I think I saw it somewhere.

　　 A. a, the　　　 B. the , the　　 C. the, a　　 D. a, a

14. Listen to the tape. How sweet the music ______!

　　 A. sounds　　 B. looks　　 C. hears　　 D. feels

13. The factory _______ since 1988.

　　 A. has opened　 B. opened　 C. has been open　 D. has been opening

12. How long have you ______ these books?

　　 A. kept　　 B. bought　 C. borrowed　　 D. lent