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.
