6.--______ I go home now, sir?

--No, you ______. You should finish the composition first.

A. Might; wouldn’t　 　　　　　　　　　　　 B. May; had better not

C. Must; mustn’t 　　　　　　　　　　　　　　 D. Need; mustn’t

5. 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

4. I ______ her, but I never could.

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

3. 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

2. Look at the ground, it is wet. It 　________ last night.

A．must have rained 　　 B．must rain 　　　　　　 C．could have rained 　　 D．may have rained　

1.--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

20. Service was included in the bill, so you ______ the waiter. It was a waste of money.

　A. will not tip 　　　　　 B. may not tip 　　　　　　　 C. needn’t 　have tipped　 D. must not tip

19.　Harry has been reading all day -he ______ be tired.

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

18. Our teacher demanded our report ________ before five.

A. must be handed in 　　　 B. be handed in

C. should hand in 　　　　　　 D. need be handed in

17. ---Catherine, I have cleaned the room for you.

---Thanks. You_____ it. I could manage it myself.

　A. needn’t 　do　 　　　　　 B. needn’t 　have done 　　　　　　　　　　　　　　　 　　 C. mustn’t 　do　 　　　 D. shouldn’t 　have done