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1) She's not at the university today. She __________ have overslept.

a) should b) might c) couldn't d) mustn't

2) Our grandfather moved the cupboard by himself. He's okay, but he __________ have injured his back.

a) could b) couldn't c) should d) must

3) My friends haven't arrived at the party yet. They don't know this city very well. They ____________ have got lost.

a) should b) must c) shouldn't d) mustn't

4) Tom's tired today. He definitely __________ have stayed up so late last night.

a) shouldn't b) couldn't c) may d) could

5) How did John catch a cold? - I'm not sure. He __________ have gone out in the rain.

a) couldn't b) should c) may d) mustn't

6) Jane didn't answer the phone. She ____________ been sleeping.

a) should have b) might have c) hadn't d) mustn't have

7) I think I ate too much at dinner. I definitely __________ skipped dessert.

a) should have b) shouldn't have c) had d) must have

8) It's too bad you didn't practice for the marathon. You _________ won.

a) could have b) may not have c) must have d) couldn't have

9) Mary had a lot of homework. She ____________ gone to the party last.

a) couldn't have b) must not have c) hadn't d) shouldn't have

10) Thomas ______________ in a car accident yesterday. He was home all day.

a) shouldn't be b) mustn't be c) couldn't have been

d) shouldn't have been