1. must have missed
2.that you can think highly of
3. wouldn't/couldn’t be so foolish 4.that all schools should purchase
5. needn’t have dressed up/needn’t have been dressed
6. must have had some idea
7. must have referred to
8.could have worked
9. could have done better
10.can’t be too careful
11.We could have managed (to finish/complete)
12. can/could never/not have imagined
13.can’t / couldn’t have referred to 14.need not have attached importance to
15.should have been slept