1) The lights are on so I’m sure he’s at home. | The lights are on so he _____ at home. a) MUST BE b) CAN'T BE c) ARE 2) I’m sure I left my umbrella at home. I don’t have it now. | I _______ my umbrella at home. a) MUST LEFT b) CAN'T HAVE LEFT c) MUST HAVE LEFT 3) I think perhaps this is their house. | This ______ their house. a) MIGHT BE b) MUST BE c) COULD BE 4) I’m sure Pete wasn’t very ill. He was only off for one day. | Pete ____ very ill. a) CAN’T HAVE BEEN b) DIDN'T c) CAN'T BE 5) I’m sure Bob and Bill haven’t got lost. They had a map. | Bob and Bill ____. a) MUST HAVE GOT LOST b) CAN'T HAVE LOST c) CAN’T HAVE GOT LOST 6) I’m not sure if she’ll like her present. | She ______________ like her present. a) CANNOT b) MIGHT NOT c) MAY NOT 7) You saw Mimi yesterday? Impossible! She was in bed with chickenpox. | You _____ Mimi yesterday. a) MAY NOT HAVE SEEN b) CAN'T SEEN c) CAN’T HAVE SEEN 8) Betty’s crying. Perhaps she had a row with her boyfriend. | Betty _______ a row with her boyfriend. a) MIGHT HAVE HAD b) MUST HAVE HAD c) CAN'T HAVE HAD 9) I’m sure she’s not American, she hasn’t got an American accent. | She _______ American. a) CAN'T HAVE BEEN b) CAN’T BE c) MUST HAVE BEEN 10) They didn’t come to our party. Maybe they didn’t receive the invitation. | They ______ the invitation. a) MIGHT NOT HAVE RECEIVED b) MAY NOT HAVE RECEIVED c) CAN'T HAVE RECEIVED

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