Must, mustn't, have to, don't have to,may, might, could, should, can.

You _________ listen to your teacher.

You _______ run at school.

You _________ eat a lot of sweets.

You _______ speak English at English lessons.

You __________ use your mobile phone at the lessons

You ________sleep in the class.

You _______ wash your hand before lunch.

You ... apologise; it isn't necessary.

We ...  talk to each other because it was an exam.

You ... take any money. It wasn't necessary.

We went to bed right after dinner because we ... get up early the following day.

I ... wear glasses, I still can see perfectly well.

You ... to tell her that you are sorry.

It's necessary to arrive before 11.00