--______ I go home now, sir?www.7caiedu.cn
--No, you ______. You should finish the composition first.www.7caiedu.cn
A. Might; wouldn’t B. May; had better notwww.7caiedu.cn
C. Must; mustn’t D. Need; mustn’t
Bobby ______ me your secret, but he meant no harm.
A. shouldn’t have told B. should tell C. mustn’t have told D. could tell
I ______ her, but I never could.
A. ought to help B. must help C. must have helped D. ought to have helped
I promised to get there before 5 o’clock, but now the traffic is still so heavy. They _____ for me impatiently.
A. may wait B. must be waiting C. could wait D. ought to wait
Look at the ground, it is wet. It ________ last night.www.7caiedu.cn
A．must have rained B．must rain C．could have rained D．may have rained
--Who______ it be that is knocking at the door?
--It ______ be Father, but I’m not sure.
A. can; must B. can; may C. must; can D. may; must
