21.Visitors_______ not to touch the exhibits (NMET2001　 32)

　　 A.will request　　　　 B.request　　　 C.are requesting　　　　 D.are requested

20.I______ ping-pong quite well, but I haven't had time to play since the new year.(NMET2001　 30)

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

19.Selecting a mobil 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(NMET2001　 24)

18.As we joined the big crowd I got ______ from my friends.(NMET2001　 23)

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

17.The repoter said that the UFO_____ east to west when he saw it.(NMET2000　 25)

　　 A.was travelling　　　 B.travelled　　　　 C.had been travelling　　　　 D.was to travel

16.---How are you today ?

　　 ---Oh, I _____ as ill as I do now for a very long time.(NMET2000 　20)

　　 A.didn't feel　　　 B.wasn't feeling　　　　 C.don't feel　　　　 D.haven't felt

15.---You've left the light on.

　　 ---Oh, so I have. ______ and turn it off.(NMET2000　 13)

　　 A.I'll go　　　　　　 B.I've gone　　　　 C.I go　　　　 D.I'm going

14. All the preparations for the task _____, and we're ready to start.(NMET2000 春招 19)

　　 A. completed　　 B. complete　　　 C. had been completed　　　 D. have been completed

13.---You're drinking too much.

　　 ---Only at home. No one______ me but you.(NMET2000 春招 14)

　　 A. is seeing　　　　　 B. had seen　　　　 C. sees　　　　　　 D. saw

12. There was a lot of fun at yesterday's party. You _____ come, but why didn't you? .(99 上海　 14)

　　 A. must have　　　 B. should　　　　　 C. need have　　　　　　　 D. ought to have