1 . Hiking trips ________ sound exciting to most kids, but few realize they ________ be uncomfortable and even dangerous.

A．would; should

B．must; should

C．may; can

D．can; will

3 . As we all know, very loud noise ________ make people sick or drive them mad.

A．should

B．need

C．can

D．must

5 . —Look! Someone is coming towards us. It must be Mrs. Zhang.
—No. It ________ (not) be her. She is on holiday in another city these days.(所给词的适当形式填空)

7 . — I didn’t attend the opening ceremony yesterday because I got bitten by a bee.
— Oh, be careful. Although they are small, some types      really dangerous.

A．will be

B．can be

C．should be

D．must be

8 . 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.

9 . I guess this book ______ be Mary’s, but I’m not sure.

A．must

B．mustn’t

C．may

D．can