9. Can you help me __________ my math?

8. Let’s talk __________ the picture.

7. They are waiting __________ the bus stop.

6. Who are you waiting __________?

5. Here are some apple __________ you.

4. Do you go shopping __________ Sunday?

3. The mall is open __________ 6:00 a.m. to 12:00 p.m.

2. They are listening __________ the teacher.

1. I want to swim __________ the river.

12. 为……而工作___________________