10 Insert can, may, must. 1. Buses … come on time.
2. … I smoke here?
3. You … pay for things that you buy,
4. He … drive a car well.
5. You … finish this work by six o'clock.
6. They ... speak French.
7. He … stay here for a while.
8. You ... take my book.
9. ... you go to the office on Saturday?
10. We ... be at the office on time.

Объяснение:

1. Buses must come on time.

2. Can I smoke here?

3. You must pay for things that you buy,

4. He may drive a car well.

5. You must finish this work by six o'clock.

6. They can speak French.

7. He can stay here for a while.

8. You can take my book.

9. may you go to the office on Saturday?

10. We must be at the office on time.

Вроде бы так.