1.The man who/that brought our textbooks here yesterday is in the next room.
2.The magazine (that /which) he has taken away is mine.
3.The students who/that don't study hard will not pass the examination.
4.The woman (whom/who/that) you saw in the park is our geography teacher.
5.The letter (that/which) I received yesterday is from my sister.
6.The play (that/which) we saw last night was wonderful.
7.This is the boy whose sister is a famous singer.