Fill in the gap with a suitable relative pronoun

Fill in the gap with a sutiable relative pronoun.
1.Have you got the money......I lent you yesterday 
2.The man.....I had seen before wasn't at the party 
3.This ia a machine..... Cost half a million pounds 
4.She's the singer....has just signed a contract whith a recording company 
5.What was the name of the man....lent you the money