21.It’s nearly seven o’clock.Jack_____be here at any moment.(NMET)

　　　 A.must　　 B.need　　 C.should　　

20.Tom ought not to_____me your secret ,but he meant no harm. (NMET)

　　　 A.have told　　 B.tell　　 C.be telling　　 D.having told

19.Sir,you_____be sitting in this waiting-room.It is for women and children

　　　 only.(上海)

　　　 A.oughtn’t to　　’t　　 C.won’t　　 D.don’t

18.You don’t______to go there if you have no time.(上海)

　　　 A.need　　 B.want　　 C.must　　 D.ought

17.There is plenty of time.She____. (NMET)

　　　 A.must have hurried　　 B.needn’t have hurried

　　　 C.must not hurry　　　　 D.couldn’t have hurried

16.I didn’t see her in the meeting-room this morning.She____at the meeting.

　　　 (上海)

　　　 A.mustn’t have spoken　　 B.shoudn’t have spoken

　　　 C.needn’t have spoken　　 D.couldn’t have spoken

15.Be sure to write to us,_____? (NMET)

　　　 A.will you　　 B.aren’t you　　 you　　 D.mustn’t you

14.I didn’t hear the phone ,I_____asleep. (NMET)

　　　 A.must be　　 B.must have been　　 C.should be　　 D.should have been

13.We_____last night ,but we went to the concert instead. (NMET)

　　　 A.must have studied　　 B.might study

　　　 C.should have studied　　 D.would study

12.A computer____think for itself ; it must be told what to do.(NMET)

　　　’t　　 B.couldn’t　　 C.may not　　 D.might not