Waste paper mustn’t _______. We should keep our environment clean.
—Tom, what classes do you have every day? —Well, Mom, we have English, math, Chinese and some ______ classes.
______ Ling Ling is tired, _______ she wants to have a rest.
_______ there any interesting news in today’s newspaper?
I want _____ a policeman because it is an exciting ________.
—Hello, is that Lisa speaking? —Yes,___________