It was seven o;clock in the morning ____ he came back.It was really at seven o’clock ___ he came back from work this morning.
--___ do you want? --I want a book on history.
Shortly after the accident, two ___ police were sent to the spot to keep order.
Mr. Wang said that he ___ next year.
In the dark street, there wasn’t a single person ___ she could turn for help.
Jennifer hates to do her homework.In fact, no one ___it.