It was when she was about to go to bed ______ the telephone rang.
Michael has a temperature, so he isn’t able to come.—____
There is a teacher’s desk _______ the classroom. Mr. Liu is standing _______ it.
What’s the matter with you ?—Oh, I’m not feeling well in the stomach . I_________so much fried fish just now .
Today, we’ll discuss a number of cases _______ parents have much difficulty in communicating with their children.