Problem: Given the question: M: It's really no surprise. You know she was popular even when she was a child. What was said before this conversation?
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The answer is:
W: There were more than a hundred people at Kate's birthday party. How come she's got so many friends?

Problem: Given the question: M: It was lying under a tree between the language lab and the library building. W: How do you like this bag? M: Yah! It's strong and wonderfully designed. W: How much is it? M: 69 dollars and 50 cents. W: I'll take one tomorrow. Oh. It's 6:30. I know the station gives the news every hour on the hour, but I don't know when they announce the weather. M: Ten minutes to and ten minutes after the hour. W: I see. What was said before this conversation?
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The answer is:
W: Where did you say you found your schoolbag?

Problem: Given the question: M: Yes, we do. You'll find it in Section 24 on the top shelf. What was said before this conversation?
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The answer is:
W: I'm looking for textbook for my Psychology course. It's called "Introduction to Educational Psychology". Do you have it?