24. — Someone is knocking at the door. It _________ be Tom.— No, it ________ be him; he has gone to Sydney.
Many journalists were sent to ________ the terrible disaster immediately the earthquake broke out in Sichuan Province on May 12th,2008.
I guess we’ve already talked about this before but I’ll ask you again just __________.
It is required by law that the children above six years old in our country ________ to school to receive education.
The audience ______ before TV sets are listening to Yi Zhongtian’s stories with their eyes _____ upon him.
Our son doesn’t know what to ______ at the university;he can’t make up his mind about his future.