2 . —Listen! Who is knocking at the door?_______ it be Alice?
—No, Alice has gone to town. It ________be Mary.（may/can）（用适当的词填空）

3 . I ___________ have hurt your feelings but it was not my intention.

5 . 我还没有看到杰克的文章。他可能还没有完成。
I haven’t seen Jack’s article. He ________________________ it. ( finish )

6 . 语法填空
1. Sometimes chopsticks are quite artistic. Truly elegant chopsticks might________(make) of gold and silver with Chinese characters.
2. When I was small, my mom ________ read me stories at night．
3. The accident ________ have been caused by a dog running across the road, but we don't know for sure．
4. He looked so hungry as though he ________ (eat) a decent meal for a month．
5. I was caught in a traffic jam for over an hour, otherwise, I ________ (keep) you waiting for such a long time．
6. Although passing the driving test ________ be difficult now, it's worth the efforts．
7. My mother ________ (be) angry with me, but I couldn't shut my mouth before I shouted at her!
8. I'm not sure of the reason for the dog's illness, but it ________ (cause) by eating too much．
9. —Can I pay the bill by check?
—Sorry, sir． But it is the rule of our hotel that payment ________ be made in cash．
10. Passengers ________ talk to the driver while the bus is moving, because it will take his focus off the road．

7 . 改错
1. As the kid, I loved to watch cartoons, but no matter how many times I asked to watching them, my parents would not to let me.
2. Some classmates suggest we can go to places of interest nearby.
3. He mustn't be a basketball player, because he is much too short．
4. Robert's new book about space exploration is fantastic． You simply could read it．
5. Has he learnt about computer, we would have hired him to work here．
6. If we   booked a table earlier, we wouldn't be standing here in a queue．
7. All of us love the weekends, because we can't get up early on Saturdays and Sundays．
8. He might have gone to bed, for the light was out．
9. He commanded that roads built to link castles across the land．
10. We must go to the concert tonight, but we are not sure yet．

8 . 用适当的情态动词填空
（1）—Excuse me. Is this the right way to the Summer Palace?
—Sorry, I'm not sure. But it ____________be.
（2）—Do you know where David is? I couldn't find him anywhere.
—Well, he ____________have gone far - his coat's still here.
（3）Mr. Bush is on time for everything. How ____________it be that he was late for the important meeting?
（4）He ____________ have completed his work; otherwise,he wouldn't be enjoying himself by the seaside.
（5）Look!The light in the office is still on. Our English teacher ____________be correcting our exam papers.

9 . Sorry, I’m late. I ______ have turned off the alarm clock and gone back to sleep again.

A．might	B．should
C．can’t	D．will

10 . ---Who can it be that hasn’t handed in his composition?
---It ______ be Robinson. He ______ it in yesterday.

A．will; should hand	B．must; should have handed
C．may; can’t hand	D．can; could have handed