32. Visitors 　　　　　　not to touch the exhibits.

A. will request 　　　　　　 B. request 　　

C. are requesting　　 D. are requested

31. A computer can only do 　　　　　　you have instructed it to do.

A. how　　 　　　B. after　　　　 　C. what　　　　　 D. when

30. I 　　　　　　ping-pong quite well，but l haven’t had time to play since the new year.

A. will play　 　　B. have played　 C. played 　　　　D. play

29. The warmth of 　　　　　　sweater will of course be determined by the sort of wool used.

A. the；the　 　　B. the；不填　　　 C. 不填；the　 　D. 不填；不填

28. It is generally believed that teaching is 　　　　　　it is a science.

A. an art much as　　　　　　　　 B. much an art as

C. as an art much as　　　　　　 　D. as much an art as

27. The home improvements have taken what little there is 　　　　　　my spare time.

A. from　 　　　B. in 　　　　　　C. of 　　　　　　D. at

26. We didn’t plan our art exhibition like that but it 　　　　　　very well.

　　 A. worked out　 B. tried out 　　　C. went on 　　　D. carried on

25. The Parkers bought a new house but 　　　　　　will need a lot of work before they can move in.

　　 A. they　　　　　 B. it 　　　　　　C. one 　　　　　D. which

24. Selecting a mobile phone for personal use is no easy task because technology 　　　　　　so rapidly.

A. is changing　 　　　　　 　　B. has changed　

C. will have changed 　　　　　 D. will change

23. As we joined the big crowd I got 　　　　　　from my friends.

　　 A. separated. 　　B. spared 　　　　C. lost　　 　　　　D. missed