Modal verbs of obligation

You __________ tell anyone what I just told you. It's a secret.

• don't have to

• mustn't

The museum is free. You _________ pay to get in.

• mustn't

• don't have to

John's a millionaire. He _____________ go to work.

• doesn't have to

• mustn't

You __________ smoke inside the school.

• mustn't

• don't have to

I _______________ clean the floor today because I cleaned it yesterday.

• mustn't

• don't have to

We _____________ eat in class.

• must

• mustn't

Students ________ bring their mobile phones to the school.

• must

• mustn't

I _______ do my homework everyday.

• must

• mustn't

You _________ wash your hands before eating.

• must

• mustn't

You ___________ use the dictionary in the exam.

• must

• mustn't