Have To / Don't Have To — Bài Tập 1

A doctor ___ know a lot about medicine.

The players ___ follow the coach's instructions.

The baby is sleeping. We ___ make noise.

He ___ work on Saturdays. His office is closed.

A pilot ___ wear a uniform when he is on duty.

To be a professional athlete, you ___ train very hard.

You ___ pay for the whole meal yourself; we can split the bill.

We ___ cancel our trip because my passport didn't arrive in time.

You ___ answer my question if you don't know the answer.

You ___ tell me what's wrong, but I'm here for you if you want to talk.