modal verbs of obligation, prohibition and permission

I was using my pencil a minute ago. It ..... be here somewhere!

• can

• mustn't

• have to

• must

You really ..... be late again

• must not

• don't have to

• have to

• must

You ... forget your sun cream. It’s going to be very hot!

• mustn't

• don't have to

• can

• must

Which sign are you more likely to see at an airport: Bags ... not be left unattended.

• have

• can

• must

• fly

...you open the window, please.

• can

• must

I really ..... try to get fit.

• can

• have to

• must

• don't have to

The test starts at 10.30. You ..... be late.

• can't

• must

• don't have to

• mustn't

You ..... be tired. You’ve only just got out of bed!

• have to

• can't

• mustn't

• don't have to

She ..... be very pleased with herself. She got the best grades.

• must

• can

• have to

• mustn't

He ... be exhausted after such a long flight

• don't have to

• must

• have to

• mustn't