1) I'm sure the new version ... work well. a) may b) will c) should 2) I ... have gone out last night. I was exhausted. a) couldn't b) wouldn't c) mustn't 3) It's highly unlikely ... appear. a) for flying cars to b) that flying cars will 4) There ... be no such thing as paper money in 50 years. a) may b) can c) must 5) Sorry, you did tell me. I ... have forgotten. a) may b) can c) must 6) This will be a good opportunity and it ... take you places. a) must b) should c) has got to

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