--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

 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 

 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

 I ______ her, but I never could.

A. ought to help     B. must help       C. must have helped  D. ought to have helped

 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 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

 --______ he use your bike?

--Certainly. Here is the key.

A. Shall             B. Must            C. Will              D. Does

 Harry has been reading all day —he ______ be tired.

A. should            B. has got to      C. has to            D. must

 It has been announced that candidates _____ remain in their seats until all the papers have been collected.

A. can               B. will            C. may               D. shall

 -- Shall I hold the bandage with tape? 

-- Yes, but you put butter, oil or ointment on burns as they may cause infection.

A. in the place, needn’t              B. in place, mustn’t

C. in the place, can’t                                     D. in place, oughtn’t