1. I was sitting ____ Mr. Brown and Mrs. Brown.
2. I’ve got a letter _____ my boyfriend.
3. I met him _____ 1999.
4. What do you do ___your free time?
5. I’ll have a party ___  Friday evening.
6. David is good __  Math.
7. Are you interested ___ sports?
8. We always go to Da Lat ___ vacation
9. Tell me more ___ your family.
10. Are you tired ___watching TV?
11. She learns how to use a computer ___ her Computer Science class.
12. The reason _____ this meeting is to discuss the cause of the reduction in price.
13. I think your attitude _____ your sister is very bad indeed.
14. ___ my opinion, he is an excellent pianist.
15. What did you have ______lunch?
16. They have a meeting ___________ 6.30 and 9.30.
17. My mother often picks me ___________ from the school.
18. I’m going to invite my friends to come over ___________ dinner tonight.
19. Next summer, my family will have a vacation __________ Thailand and stay there ________ one week.
20. The teacher divided the class ____ two groups.