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) might have c) can't 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) can't have 6) Oh no! My phone's not in my bag. I _____ left it at home. a) must have b) can 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) may have c) couldn't have 8) I _____ left my wallet in the restaurant. I paid for the taxi home afterwards. a) must have b) could have c) can't have

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