Modal verbs

It's freezing in here. The heating ... be working properly.

• must

• can

• can't

• might

If you don't catch that train, you ... be late for school.

• will

• must

• should

• can

Do you think I ... call her then?

Well, that's my advice.

• must

• have to

• should

• might

He ...... be able to help you.

• must

• may

• should

• will

You have such a beautiful voice. You ________ sing for us!

• should

• can

• will

• can't

You............. tell anyone what I just told you. It's a secret.

• must

• have to

• mustn't

• hasn't to