30. He ________ eating American food since he came here.
A. used to B. has been used C. has been used to D. was used to
31. A computer ________ think for itself; it ________ be told what to do.
A. may not, must B. mustn't, might C. shouldn't, could D. can't, must
32. "________ you mind my opening the window?" "Not at all. "
A. Shall B. Should C. Will D. Would
33.1 didn't hear the phone. I _________ asleep.
A. must be B. must have been C. should have been D. could have been
34. You _________ me about it earlier, but you didn't.
A. should have told B. would have told C. must have told D. should tell
35. The teacher told the students that they ________ keep silent in class all the time.
A. ought to not B. ought not to C. ought not to have D. can't
36. "May I go now?" "No, you ________. "
A. mustn't B. needn't C. mightn't D. won't
37. You _________ do the exercise if you don't want to.
A. may not B. can't C. mustn't D. needn't
38. You _________ pay more attention to your spelling next time.
A. would B. should C. will D. shall
39. The girl _________ out alone at night.
A. dare not go B. dare not to go C. dares not go D. does not dare go
40. There ________ be a lot of small houses on both sides of the street.
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