8. 选C。本题主要考查情态动词。汤姆今天没来上学，他可能是生病了，也有别的可能。所以只能是一种推测。故应选C。

7. 选B。此题考查情态动词的用法。may用于征求对方的意见。请注意may的这一用法。

6. 选B。情态动词may后接动词原型“be”，表示一种可能性或推测。

5. 选D。此题考查知识点为情态动词must的用法。考生错解的原因在于没有掌握must引起的一般疑问句的否定回答。

4. 选A。考查情态动词must的用法。考生错解的原因在于没有掌握它的用法。

3. 选B。此题考查学生对情态动词用法的掌握情况。题中的情景是问路，而被问者并不知道去公园的路，建议问路人去问警察，说警察可能知道。最后一句说的是一种可能性。

2. 选A。May开头的问句是“请求许可”的问句意为“我可以现在去游泳吗？”如果允许，答句是Yes, you may。如果不允许，答句是No, you can’t。如果表示“强烈的”不允许，“决不能”，则答句是No, you mustn’t。此题意为“现在”你“决不能”去游泳，应该先完成作业。因此选A。

1. 选C。问句中的can询问“能力”的问句意为“你能在河里游泳吗？”如果能，则答Yes, I can；如果不能，则答No, I can’t此题选C。

　Miss Wu : Can I help you?

　Li Gang : Yes, I'd like to return this book, please.

　Miss Wu : (1).

　Li Gang : No, I couldn't read it. I had a hard time reading a few pages, and

then I decided to give up.

　Miss Wu : (2).

　Li Gang : It wasn't the language. It was the words. They are too small for me.

　Miss Wu : (3).What can I do for you then?

　Li Gang : Well, I'd be glad if you could find me another book.

　Miss Wu : (4).

　Li Gang : Yes, but one with bigger words.

　Miss Wu : (5).

　Li Gang : Oh, Oliver Twist. This one is fine. And the words are much bigger.

Thank you very much.

　Miss Wu : You're welcome.

　A. What about this one?

　B. You can't keep the book for long.

　C. Another English storybook?

　D. Isn't it interesting?

　E. Oh? But I know you are good at English.

　F. Did you enjoy the book?

　G. Yes, they are really small.