Заполните пропуски модальными глаголами can, may, must, should.

1. Nina is ill. She ... stay in bed.
2. Drivers ... stop when they see the red light.
3. Betty asked: "... I open the window?"
4. Betty asked her father. "... I go to the concert tonight?" Her father said, "Yes, you ... go."
5. Mary is free tonight. She ... go to the dance.
6. Alec will have an English lesson tomorrow. He ... study tonight.
7. Mark is a good student. He ... speak English well.
8. There is no ink in my pen. ... I write with a pencil?
9. My friend gave me an interesting book to read. She said, "You ... keep it for seven days."
10. You ... do what the doctor says.
11. You ... study much if you want to pass the examination well.
12. You ... not smoke in the dining-room.
13. Little children ... go to bed early.
14. If you are ill, you ... consult a doctor.