题目内容：
根据下列材料，回答题：
Seller: The total is $10.50. How will you pay
Mrs. Green: Do you take credit cards (信用卡)
Seller: Sorry, I don' t. Cash only (只在现金).
Mrs. Green : OK, here' s $ 20.
Seller: Thanks. Here's your change (零钱). Do you need a bag
Mrs. Green: Yes, please.
Seller: Here you go.
Mrs. Green: Thank you. Have a nice day.
Seller: You, too.
根据上面的表格和对话，选择正确答案。
Mrs. Green wants __________.
参考答案：
答案解析：