2 . —Everyone in my class passed the exam.
—Oh, really? It ________ difficult.

A．can’t have been	B．needn’t have been
C．must be	D．mightn’t be

3 . —Where ________ little Tom be now?
—I wonder what he ________.

A．can;is up to	B．must;is about
C．may;is doing	D．must;playing

4 . The world went into shock, most people having assumed that this space flight ________ be more dangerous than travelling in an aeroplane.

A．should

B．shall

C．would

D．could

5 . 选词填空。
1. He ________(must/might) get here in time ,but I can’t be sure.
2. He ________(can’t/mustn’t) have missed the train; he arrrived at the train station two hours early.
3. That must be a mistake. No, it ________(can’t/mustn’t) be a mistake.
4. Paul did a great job in the speech contest. He ________(must/can) have practised many times last week.
5. He ________(may/must) be at his office now, but you’d better make a phone to make sure.
6. Look, someone’s in the room. Who ________(can/must) it be ?
7. It ________(must have /may have) rained last night, for the ground is still wet.
8. I don’t know where she is, she ________(may/must) be in Wuhan.
9. With drones’ ability to see ahead, they ________(could/should ) signal any problem, so that fast -moving trains would be able to react in time.
10. I ________(needn’t/can’t) have bought so much wine -only two people came.

6 . Waking up suddenly________lead to rapid heart rate and high blood pressure.

A．must

B．would

C．can

D．shall

7 . I asked in the bookshop about Will Dutton’s latest book, but all they           tell me was that it would come out before the end of the year.

A．might

B．must

C．could

D．should