合并成含有定语从句的主从复合句

1The man who bought out textbooks here yesterday is in the next room
2 The magazine that he has taken away is mine.
3 The woman whom you saw in the park is our geography teacher
4 The hospital which was built five years ago has been modernized.
5 Hangzhou is a famous city in China in which many people come to buy tea.
6 I don't know the reason that she got so angry.
7 Tom failed in the exam which made us suprised.