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30 tháng 8 2018

Fill in the blanks with mustn't or don't / doesn't have to:

1. They...don't have to.....work on Sunday.

2. Visitors....don't have to......feed the animal.

3. Tim....mustn't ...wear uniform at school.

4. Don't make so much noise. We.....mustn't ....wake the baby.

5. There is a lift in the building, so I...mustn't ......climb the stairs.

6. You....don't have to ......touch that switch. It's very dangerous.

7. Staff....mustn't ...smoke when serving customers.

8. Sally is extremly rich. She....doesn't have to......work.

9. I don't want anybody to know our plan. You......mustn't ......tell anymore.

10. You..mustn't .......be a good player to enjoy a game of tennis.