3. Jack’s ill, so they ______ (must / have to) change their plans.

2. Mr. Joseph has stayed in the US for several years. He _____(may / can) speak English quite well.

1. When we are cooking with a gas fire, we ________(can / must) keep the window open.

10. She is not _________(苗条的)enough to wear these tight trousers.

第二节：用正确的情态动词填空(共5小题；5分)

9. You should do some _________(研究) before making the final decision.

8. He has been working for a long time, but he is still full of __________.(energetic)

7. To succeed, we must ___________(结合) talent with working hard.

6. Wang Pengwei stopped worrying and started advertising the _______(好处) of his food.

5. ________ (好奇心)drove Wang Pengwei inside Yong Hui’s restaurant.

4. This restaurant was not giving its ______(顾客) energy-giving food.