Chọn và điền vào chỗ trống, sử dụng từ Can/ Can’t, Could/ Couldn’t, Must/ Mustn’t.
1. You _________ work harder if you want to pass the exam.
2. I don’t want anyone to know. You _________ tell anyone.
3. _________ you please open the door?
4. _________ I go out tonight? No, you _________ study English.
5. We haven’t got much time. We _________ hurry.
6. He _________ play tennis very well now but he _________ play really well when he was young.
7. Tom _________ drive but he hasn’t got a car.
8. The boy fell into the river but fortunately we _________rescue him.
9. We haven’t got enough food at home so we _________ go shopping today.
10. She wasn’t at home when I phoned but I _________ contact her at her office.
11. I can’t stay in bed tomorrow morning because I _________ work.
12. You _________ touch that switch. It’s very dangerous.
13. _________ you post this letter for me?
14. Brian has got three houses, six cars, a yacht. He _________ be very rich.
15. You’ve only just had dinner. You _________ be hungry.