填入适当的单词，使对话完整。（每空一词，共5分)
A: Can I       you?
B: Yes, please. I want to      a scarf for my sister.
A: What’s her     colour?
B: Blue.
A:        you are.
B: How much is it?
A:Nine dollars.
B:I’ll take it.     !
A:You are welcome