听第10段材料，回答第15至17题。
15.What are they discussing?
A、What to have for lunch.
B、Where to go for lunch.
C、When to have lunch.
16.What can we learn about the man?
A、He usually doesn’t eat fast fooD、
B、He often eats in a restaurant near his home.
C、He can’t afford an expensive lunch that day.
17.Where are they probably going right after this conversation?
A、A、supermarket.
B、A、fast-food place.
C、A、French restaurant.