用恰当的介词填空。
1. Jim was surprised to see a foreigner go out             the lift.
2. "How many ways have you thought             to solve the problem?" the teacher asked.
3. Mary stood             the desk while her mother was explaining the problem to her.
4. Who sits             front of you in the classroom?
5. Do you often help your mother             the housework?  
6. —When will the guests arrive here? 
    —             five minutes.
7. I live on the fifth floor. Linda lives two floors              me, on the third floor.
8. They planted some trees and flowers                every side             the house.

用恰当的介词 (in, on, of, at, with, beside或below) 填空。