Complete the sentences with mustn't or don't have to.
1. The museum is free. You don't have to pay.
2. You have to wear smart clothes. You ___ wear jeans.
3. The speed limit is 120 km/h. You ___ drive faster.
4. Your hours will be 9-5 Monday to Friday. You ___ work at weekends.
5. That river is dangerous. You ___ swim in it.
6. It's a very small flat. You ___ clean it every day.

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