When she was young, she ………… swim across this river.

• was able

• had better

• would

• should

Is that Tom over there? -No, it………… be him. He’s not that tall.

• shouldn’t

• might not

• can’t

• won’t

They are doing very hard on their project. It ………… be very important to them.

• should

• could

• must

• would

You look very tired this morning. You ………… up late last night.

• shouldn't have stayed

• mustn’t stay

• couldn’t have stayed

• can’t stay

He ………… very hard to get such a good result.

• could be studying

• may be studying

• must have studied

• should have studied

The lights in Susan’s room are still on. She ………… her assignment.

• must have written

• might have written

• should have written

• might be writing

The fire spread through the building very quickly, but everyone ………… escape.

• could

• can be able

• was able to

• could be

We didn’t go out last night. We ………… to the movies, but we decided to stay at home.

• could go

• can go

• could be going

• could have gone

You’ve been travelling all day. You ………… tired.

• must be

• have been

• are able to

• ought to be

I hear that your exams are next week. You ………… very hard right now.

• must to study

• must be studying

• had to study

• must have studied