1) ……… used to express regret a) should have b) could have c) might have d) must have 2) I……………………… gone to the cinema, but I decided to stay home. a) must have b) may have  c) could have d) should have 3) They were ……………bring their assignment.. a) could have b) supposed to c) must have d) would have 4) Police think the suspect may have ………… the country using a fake passport. a) leaves b) leave c) Leften d) left

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