1. A customer is someone who buys something from a shop.
2. The bus which goes to the airport runs every half hour.
3. Eloisa, whom I've known for a very long time, is one of my closest friends.
4. This is the televesion that I'm going to buy.
5. I met a woman whose son is an English teacher.
6. My office, which is on the first floor, is very big.
7. It's the film my friends wants to see next sunday.