Frank insisted that he was not asleep ________ I had great difficulty in waking him up.[ ]

It was in this house _____ he heard some strange sounds. [ ]

Li Ming studied very hard. As a result, he succeeded ______ the entrance examination to college.

Mom, Bill is coming to dinner this evening.—OK. Let’s give him _________to eat.

If they ______ what I was saying, they’d know what I was talking about