which引导的定语从句例句？

which引导的定语从句例句有：

1.Football is a game which is liked by most boys.

2.We'll go to hear the famous singer (whom/that/who) we have often talked about.

3.He bought a book, which was written by LuXun, and which he decided to give to his friend.

4.We told him to consult the doctor,which advice he took.