1. This is the man. I met him in Paris.
->_____This is the man whom/that I met in Paris
2. I wanted the painting. You bought it.
->_____I wanted the painting which you bought.
3. This is the chair. My parents gave it to me
->________This is the chair which/that my parents gave to me
4. She’s the woman. She telephoned the police.
-> ______She’s the woman who/that telephoned the police
5. He’s the person. He wanted to buy your house.
->   ____He’s the person who/that wanted to buy your house
6. We threw out the computer. It never worked properly.
->_____We threw out the computer which/that never worked properly