Điền vào chỗ trống với mustn’t hay don’t/ doesn’t have to

Question III. Điền vào chỗ trống với mustn’t hay don’t/ doesn’t have to.

1. They ............................ work on Saturday

2. Visitors ......................... feed the animal.

3. Tim ................................. wear uniform at school

4. You ............................ touch that switch. It’s very dangerous.

5. Don’t make so much noise. We .......................... wake the baby.

6. There is a lift in the building, so I .................................... climb the stairs.

7. Staff .................................. smoke when serving customers.

8. Sally is extremely rich. She ............ work.

9. I don’t want anyone to know about our plan. You ............ tell anyone.

10. You ............ be a good player to enjoy a game of tennis.