Find expressions in the text with the following meanings 1. Someone who buys food in a supermarket (3 expressions) 2. All the people who buy food from a particular supermarket chain, from the point of view of the chain. 3. Someone who buys the services of a private detective agency. 4. All the people who buy the services of a private detective agency, seen as a group (2 expressions). 5. Someone who sells goods or services. 6. Someone selling a house. (2 expressions) 7. Someone buying a house. (2 expressions) 8. Someone who sells hamburgers to tourists outside the Tower of London. 9. Someone whose job is buying tyres for a car compony. (4 expressions) 10. Someone who uses a computer, even if they have not bought it themself, but their company has. (2 expressions)