must, mustn't, don't/doesn't have to

Betty has got problems with her teeth. She ______ eat a lot of sweets.

You _______ drive fast. It's dangerous.

Children _______ drink lots of milk.

You _______ shout in the hospital.

Scott _______ study hard for the Geography test. It's going to be difficult.

In the summer you _______ stay in the sun for too long.

I _________ wake up early at the weekends. There's no school.

It's cloudy outside. You ___________ wear sunglasses.

The aby is sleeping. You _________ turn on the radio.

You ________ look directly at the sun. You will damage your eyes.

Beverly _______ take a taxi to work. I'll drive her there.

People _______ talk on their mobile phone while driving. They may have an accident.

Ben _________ buy a sleeping bag. He can borrow mine.

Natalie _________cross the street alone. It's dangerous.