1. If you wanted to stay in that hotel, you __ booked before!

• could have

• might have

• should have

• couldn't have

2. He __ committed the crime, as he had both the motive and the opportunity.

• can't have

• could/ might have

• would have

• should have

3. If I had known about your accident, I __ phoned you.

• should have

• might have

• must have

• would have

4. Lucy __ attended the concert, but we aren't sure.

• may have

• can't have

• should have

• would have

5. You __ finished that book already! You only started reading it an hour ago.

• can't have

• might have

• shouldn't have

• would have

6. I think they __ got lost - surely they'd be here by now!

• can have

• might have

• must have

• should have

7. Oh no! My phone isn't in my bag. I __ left it on the train.

• can have

• might have

• should have

• would have

8. She __ been a lawyer but she decided to study accountancy instead.

• can't have

• might have

• may have

• could have

9. You __ gone to Dan's party - it was fantastic!

• should have

• must have

• would have

• couldn't have

10. I'm so sorry I woke you up. I __ called you if I knew you were sleeping.

• can't have

• might not have

• shouldn't have

• wouldn't have