英语：改正句子
1. Mr White, which car was stolen yesterday, is very upset.
2. The watch which Susan bought it last week was very expensive.
3. We had to wait for an hour, which was very annoying.
4. The road on some buses were travelling suddenly collapsed.
5. I have lost the hat that I got last Christmas.
7. Peter, who father is a policeman, works at a bank.
6. There were a few guests at the party where I had never met before.
8. Peter recognised the person who stole his watch.