用适当的介词填空
1. Mary's job is to sell things ________ people.
2. We often play basketball ________ class.
3. When does your mother come home ________ work?
4. When will they arrive ________ Shanghai Station?
5. My office is ________ the second floor. You needn't go ________ lift.
6. The driver wants to find a seat ________ the old man.
7. Don't be late ________ the class meeting. We'll have it ________ three p. m.
8. I like listening ________ the music.