Вставьте подходящий модальный глагол

7. I have some free time. I can help you.

8. I don't have to go to work tomorrow because it's a public holiday.

9. May I have some water?

10. I can drive my friend's car when she is out of town.

11. You must go to this party. It is very important.

12. It's late. You should go to bed.