1.He is the pilot who/that flew our plane.
2.She is the teacher who/that takes our class
3.The Nile is a river that/which used to flood every year.
4.They are the sailors who/that work on this ship.
5.He is the man whom/who/that I borrowed some money from.
6.She is the woman who/whom/that I wrote a letter to.
7.She is the woman whose son won the school prize.
8.Is that the boy whose father is a teacher?
9.These are the letters which/that I've had from friends in Europe
10.These are photos of the friends who/that have written to me from Europe.