Exercise 1: Choose the best option

1. This is a hospital. You

mustn't

B. must

High School - English Department - Grade 11

smoke here.

C. can

D. may

be tired now.

must

D. had to

2. He had been working for more than 11 hours. He

A. mustn't

3. You

B. has to

come if you don't want to.

A. have to

4. You wear uniform at work.

A. had to

B. don't have to

B. must

C. must

C. has to

D. mustn't

D. have to

5. I'm not sure but I think it

A. must have been

C. should have been

the postman who knocked just then.

B. could have been

D. mustn't have been

B. should have called

D. mightn't have called

6. Do you think I Nick?

A. must have called

C. can't have called

7. I think Tom here. I think I saw his car.

A. should have been

C. mustn't have been

8. It rained every day during their stay, so they have had a nice holiday.

9.1 you earlier to talk about the project, but I didn't have time.

A. can

B. can't

B. can't have been

D. might have been

C. must

D. should

A. should have called

C. must have called

10. She the taxi to work today. I'm not sure.

B. might have called

D. have to call

A. may have taken

C. can't have taken

B. must have taken

D. should have taken