—I’m afraid you missed a fantastic lecture yesterday. How come you were absent from it?—If you _______ know, I asked for a day off and visited a relative of mine in hospital.
Students shouldn’t be given so difficult a problem_________they cannot work out.
Everyone likes_________of the two stories, for this story is _________than that one.
——Miss Lingam is arm in arm with Mr. Peabody! ——______sight
Mr. Oven has three children, one of whom is a child of six, ___ twins of twelve.
_________the fact that his first experiments had failed, Prof. Smith persisted in his research.