1) Why were there no buses yesterday? Maybe it was the snow or they _____ been on strike. a) must have b) might have c) couldn't have 2) You _____ seen her, surely! She was standing right in front of you. a) must have b) can't have c) might have 3) Let's ask at reception to see if they have your keys. Someone _____ found them. a) must have b) might have c) can't have 4) He _____ gone to Russia. He didn't have a passport. a) must have b) might have c) couldn't have 5) I explained the homework but she did the wrong page. She _____ misunderstood me. a) must have b) may have c) couldn't have 6) Oh no! My phone's not in my bag. I _____ left it at home. a) must have b) might have c) couldn't have 7) It is still a mystery how the robber gained access to the bank. Police are investigating whether the suspect _____ known one of the employees. a) must have b) might have c) couldn't have 8) I can't remember my password! But I _____ written it in my notebook as sometimes I do that. a) must have b) may have c) couldn't have 9) She _____ cleaned the whole house on her own in two hours. She must have had some help. a) might have b) must have c) can't have 10) He _____ known about it when I saw him. I'm sure he would have told me. a) must have b) couldn't have c) might have

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