D may have happened

　　I promised to get there before 5 o’clock, but now the rain is pouring down. They ______ for me impatiently.

　　A. may wait

　　B. ought to wait

　　C. could wait

　　D. must be waiting

　　Better go to see my sick colleague right now, ________I?

　　A. hadn’t

　　B. didn’t

　　C. don’t

　　D. won’t

　　Professor Smith, many students want to see you. __________ they wait here or outside?

　　A. Do

　　B. Shall

　　C. Will

　　D. Would

　　It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.

　　A. might have spent

　　B. ought to have spent

　　C. must have spent

　　D. could have spent

　　—Hurry up, Michael! It’s ten to three.

　　—Goodness me! The class_______. I’ll be late again.

　　A. must begin

　　B. may begin

　　C. should have begun

　　D. must have begun

　　The thief ________ in from the kitchen window as the door was closed.

　　A. may climb

　　B. must have climbed

　　C. could have climbed

　　D. should have climbed

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