听音补充对话。
A: What _____________ you _____________, Li Ming?
B: I'm _____________ my suitcase.
A: _____________ I help _____________?
B: Sure!
A: Do you _____________ this_____________?
B: No, thanks. I want _____________ _____________, please.
A: How _____________ _____________ of socks do you have?
B: I have one pair of socks.
A: One pair! You need _____________ socks.