用适当的句子完成对话。
A：1_______________________________.
B: I think I need a pair of sports shoes.
A: 2_______________________________.
B: For my son. He wears size ten.
A: 3________________________________.
B: Do you have other colors? Black isn't his color.
A: 4_________________________________.
B: OK. He likes the color brown. How much is it?
A: 5___________________________________.
B: Forty dollars? That's a bit expensive. But I'll take it.