To learn the piece of music quickly, you'd better hear it ___ as many times as possible.
They would not allow him _______ across the enemy line.
—Where did you see him for the first time?— It was in the factory _________ we worked.
—why don’t we choose that road to save time? —The bridge to it
The patient was warned _______ oily food after the operation.
The old lady had a son and two daughters,________treated her well,which made her very sad.