？？提示：一女士在商店买鞋，先试5号鞋，不合适，又试一双4号的，觉得很舒服，且是成本价，就买下来了。
Salesgirl：1________ ，madam？There are all kinds of shoes in our shop.
Woman：I want to buy a pair of sports shoes.
Salesgirl：2________？
Woman：I think size 5. I prefer white colour．But yellow ones are OK.
Salesgirl：These are size 5. You can try them on.3 ________？
Woman：Not quite. They’re a little big. May I have a look at another pair？
Salesgirl：Sure. Try on this one then．It’s size 4. 4________ now？
Woman：Comfortable. 5________ ？
Salesgirl：Twenty dollars.We are selling it at cost.
Woman：Really？ I&39;ll take it then. ________________
？？
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请帮忙给出每个问题的正确答案和分析，谢谢！