1. Policemen investigate the house. The house was broken in by a thief. (which)
2. The police asked the man. His house was invaded. (whose)
3. The man was very kind. I talked to him yesterday. (whom)
4. The picture was beautiful. She was looking at the picture. (which)
5. The book was good. I read it. (which)
6. The girl is happy. She won the race. (who
7. The city was beautiful. We spent our vacation there. (where)