1. My friend's.
2. It was my friend's birthday party.
3. Yes, i do.
4. I went with my classmates.
5. It was at my friend's house.
6. Yes, there were.
7. Yes, there were.
8. No, I didn't.
9. I ate cake and drink some orange juice.
10. The music was so good, ranging from many kinds.
11. Yes, I did
12. Yes, I did.
13. It finished at 9 p.m.
14. Yes, I did.