题目内容：

补全对话

根据对话内容，从对话后的选项中选出最佳选项。选项中有两项为多余选项。

A：Can I help you?

B：1.      I want to buy a sweater for my son.

A：We have sweaters in red, yellow and white. 2.

B：Yellow.

A：Here you are.

B：Oh, this sweater is too small. 3.

A：Yes. What about this one?

B：It’s very nice. 4.

A：It’s ten dollars.

B：OK. I’ll take it. 5.

A：You’re welcome.