Complete each sentence with mustn’t or don’t have to.

The gallery is free. You __________________ pay.
You ___________ wear jeans to school. It’s forbidden.
The speed limit is 100 km/h. You ____________ drive faster.
Your working hours will be 8-4 Monday to Friday. You _____________ work at weekends.
That river is dangerous. You _____________ swim in it.
You ____________ do this exercise. It’s not necessary.
We ____________ take the tent. Mike will do it.
I ____________ forget to type this letter. It’s very important.
You ____________ take an umbrella. It isn’t going to rain.
We ____________ hurry. There’s a lot of time.
You ____________ drop those glasses. They’ll break.
I ____________ forget my keys or I won’t get in.