Obligation, necessity and prohibition

You ___ turn on the central heating. It's automatic.

• must

• have to

• mustn't

• don't have to

The exams are next week. I ___ work harder.

• must

• have to

• mustn't

• don't have to

You ___ come with us if you don't want to.

• must

• have to

• mustn't

• don't have to

In Britain you ___ drive on the left.

• must

• have to

• mustn't

• don't have to

Dad ___ go and see a doctor. His cough is getting worse all the time.

• must

• has to

• mustn't

• doesn't have to

I can't stop and talk to you now. I ___ get to the library.

• must

• have to

• mustn't

• don't have to

You ___ cross the road without looking. It's really dangerous.

• must

• have to

• mustn't

• don't have to

You ___ come to the party if you don't feel well.

• must

• have to

• mustn't

• don't have to

Doctors sometimes ___ work at the weekend.

• must

• have to

• mustn't

• don't have to

You ___ smoke in your car, especially if there are children sitting at the back.

• must

• have to

• mustn't

• don't have to