用适当的介词填空。

1. The black shirt is _____ sale for eight dollars.    

2. They have shorts_____ all colors.    

3. What does your father do _____ Fridays?  

4. Mona often goes to see movies_____ her sisters on weekends.  

5. His cousin is good_____her friends.    

6. Her sister usually goes to school_____seven-thirty.    

7. These old people love to listen _____ Mrs Black.    

8. Please write_____me soon.    

9. Does your mother want to know_____my family?    

10. The girl usually plays ping-pong_____two hours after school.