Question

用could, can, may, must, need't 填空。

1. A: ____ you answer the question in English?
    B: Sorry, I ____ ____  I answer it in English? 
    A: No, you ____. You ____ answer it in Chinese.
2. A: ____ I  ask a question?
    B: Yes, you ____. But you ____ wait a minute.
3. A: ____ I use your eraser, Bill?
    B: Sorry, I don't have one. Ask Mary. She ____ have one.
4. A: ____ you help me do the shopping?
    B: OK. Sure.
5. A: ____ you sweep the floor?
    B: Yes. But I ____  finish my homework first.

Answer 1

1. Can; can't; Must; needn't; can
2. May; can; must
3. May; may
4. Could
5. Could; must