[Q]: M: Yes? W: Could you tell me how far it is to the National Arts Centre? M: Yes. It's quite near, about a ten-minute walk from here. W: Could you tell me how to get there? I'm a tourist here. M: Well, you walk down this street for two blocks to the traffic lights. Turn left and you will be on King Street. Walk straight along King Street, until you come to a cinema, the National Arts Centre is right opposite. You can't miss it. W: Wait a minute. I walk down this street two blocks to the traffic lights. Turn left and I will be on King Street. I walk straight along King Street, until I come to a cinema; the National Arts Centre is opposite. M: That's right. W: Thank you. M: My pleasure. What was said before this conversation?
****
[A]: W: Excuse me, sir.
input: Please answer the following: M: No. Why do you ask? W: You have so many empty cans here. M: Well, my mum wants me to keep all the cans, so that we can sell them after a while. W: Aha, you are going to make a millionaire of yourself sooner or later with all those cans. M: You bet I will. Well, that's not the point. The point is we separate reusable things from other rubbish. We have to pay the dustman for dealing with rubbish, but if we sell him these cans and other reusable material we pay less. W: That sounds a clever idea. Now what are reused in China? M: Metal, plastic, paper, books and the like. W: Just as we do back home in the States. M: And to avoid waste, the government is limiting the production of goods that can be used only once, such as bamboo chopsticks. For example, all the fast food boxes should be made of paper instead of non-reusable material. W: That will surely be helpful for a clean environment. What was said before this conversation?
++++++++++
output: W: Do you collect cola cans, Steve?
Please answer this: M: Lot's go and ask Mr. Green. What was said before this conversation?
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Answer: W: I think the last question is very difficult.
Problem: M: Here it is, on the upper shelf, next to Volumn Two. What was said before this conversation?

A: W: Jack,I can't find Volumn Ten. Could you check for me who borrowed it?
Problem: Given the question: W: Bob, it has been a long time, hasn't it? It must be at least a year. M: No. We talked at the Johnson's Christmas party last December. Don't you remember? W: That's right. Well, how are you? Still working for the Germen company? M: No. I changed my job about 4 months ago. I'm with the World Bank now. How about you? W: I'm still working at the University, but I transferred from the German Department to the Spanish Department. M: Don't you tell me you speak Spanish, too? W: Sure. I grew up in Spain, you know. German was what I studied in college. M: All I have ever managed to learn is a little Italian. W: Oh. excuse me, someone is knocking at the door. I'll talk to you again later, Bob. M: It was nice talking to you, Ann. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
M: Why, Ann, I haven't seen you for ages. How have you been?
Problem: M: No, it isn't mine. It's Sam's. What was said before this conversation?

A:
F: Is this your book, Steven?