1) It is possible that he didn't leave any fingerprints. a) might haven't left b) might not have left c) shouldn't have left d) can't have left e) mustn't have left f) ought to have left 2) It was so nice to have given me a bunch of flowers. a) needn't have given b) didn't need to give c) ought not to give d) should have given e) may not have given f) needn't have to give 3) I´m certain he was having nightmares. a) might not have been having b) shouldn't have been having c) ought to have been having d) had to be having e) must have been having f) may have been having 4) The plane is due to arrive at noon. a) should arrive b) may arrive c) might arrive d) ought to arrvie e) can arrive f) could arrive 5) He was wealthy so it wasn't necessary for him to work. a) may not work b) mustn't work c) didn't need to work d) doesn't need to work e) needn't have worked f) shouldn't work

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