Complete the following sentences with "mustn't" or "don't have to."
1. The museum is free. You _______________ pay for the entrance
2. You have to wear a uniform at school. You ______________ wear blue jeans
3. The speed limit is 90 km per hour. You ____________ drive faster.
4. You live in a very small place. You ___________ clean it every day. Just clean it twice.
5. Your job is from Monday to Friday. You ____________ come on weekends.
6. That river is extremely dangerous. You ____________ swim in it.