1) She ______ speak three languages fluently because she's lived in different countries a) can b) must have c) might not 2) He ______ have left already; his car is still here. a) can't b) could c) may 3) When I was young, I ______ swim very well. a) can b) could c) must 4) They ______ be at the office now, it's too late. a) may b) can't c) could 5) You ______ have seen her yesterday, she was out of town. a) can't b) must c) could 6) I ______ finish the project by tomorrow if I work all night. a) can't b) must c) might 7) We ______ go to the concert if we get tickets. a) can't b) must c) can 8) He ______ have been sleeping, he answered the phone immediately. a) can't b) might c) could 9) You ______ be tired after such a long journey! a) might b) can c) must 10) They ______ have taken the wrong train, they arrived on time. a) might b) can't c) could 11) I ______ play the piano when I was a child. a) could b) can c) must 12) She ______ be at home now, her car is not in the driveway. a) couldn't b) must c) can't 13) We ______ have missed the bus, we arrived too early. a) can't b) might c) could 14) He ______ have been really busy, he didn't reply to any of my messages! a) must b) couldn't c) can't

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