Leaders of many countries have been trying to _____ what it is that makes China develop so fast.
The Beatles singing Yesterday______ memories whenever we hear it.
Tom is the only one of the students who______ a winner of scholarship for four years.
I would rather______ the professor and I would rather you______ for him at once.
.Was it______ it snowed last night that you didn’t come?
The manager has to go on a business trip. His company will be left in______ of his secretary.