合并后改成定语从句（急）
1 The writer's daughter is a friend of mine. The writer wrote a book for his daughter.
2 My room-mate is a very kind-hearted boy. I borrowed the coat from him.
3 I've received the book. My father posted it to me.
4 The teacher saw what happened. He was standing nearby.
5 This is the tree. He climed it yesterday.
谢谢了