情景会话,根据所给情景用适当的句子补全对话
A：_______,sir?
B：yes,please,I want some T-shirts.
A：_______,sir?
B：I'd like two.One for my son and one for my daughter.
A：_______,sir?
B：A red one and a black one.
A：What about these?
B：OK,They're very nice._______?
A：￥50 each.
B：Here's the money.Thank you.
A：_______.