---Do you think the last problem in this math test difficult?---Yes. I could work it out.
The bell is ringing. Hurry up, ________ you’ll be late for class!
Wang Lin reads books at the school library _______ the afternoon every day.
My _______ name is Guo Ping. We are in the same school.
Scott usually gets up at 6:10, then he cleans _______ room.
— What can you see on the desk? — I can see _______ pen.