1．Frederick William Ⅰ， to whom the amber room belonged, decided not to keep it.
2．I saw a house, the windows of which were broken.
3．The first thing that he did after arriving home was doing his homework.
4．She has two sons, both of whom graduated from Harvard University.
5．This is the watch which/that I am looking for.
6．It is the tallest building that Daming has seen ever since he came here.
7．This is the man that/which my father bought a new bike for.
8．She said she would do anything that could help her mother recover from the disease.
9．Anyone who has helped to save the drowning girl is worth praising.
10．The boy and the dog that are in the picture are very lovely.
