1) This is the boy who had an accident.
2) Yesterday I saw a car which was really old.
3) Mandy is the girl x I met on Friday.
4) I haven't seen Frank, whose brother is five, for a long time now.
5) The robber stole the car x the lady parked in front of the supermarket.
6) This is the man whose house is on fire.
7) Can I talk to the girl who is sitting on the bench?
8) The book x you gave me is great.
9) She likes hamburgers which are hot.
10) Bill Clinton, who was President of the USA, has only one daughter.