input: Please answer the following: M: It's my new course. My teacher is very strict with me. What's more, there are many assignments every day. I spend most of my time on them. What was said before this conversation?
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output: W: You seem very tired recently.
Please answer this: M: OK. I watch people a lot. I do that when I travel. I've been to many countries such as Britain, Italy and Sweden. So I spend a lot of time at airports. While waiting for my flights, I watch people passing by and start my imagination. For example, the other day, when I was waiting for my flight to Greece, I saw a couple. They were buying magazines at that moment. They were not wearing business clothes, but the man was carrying a suitcase. Every few seconds, the woman looked around. I wondered if someone was following them. Perhaps they were running away, and you know, this reminded me of a story in the newspaper that day: a bank clerk stole one million pounds a week before and disappeared with his wife. There was a picture of them in the paper. The couple really looked like the wiz. Maybe I should stop them. Just then, I saw them say goodbye to each other, and the woman walked away. Well, sometimes I make mistakes like that. But I find things like that are very useful for my writing. What was said before this conversation?
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Answer: W: Good morning, everybody. Today, for our writing class, we are glad to have Mr. Henry Stone with us, a well-known writer in this country. He is going to share with us his writing experiences. Now, Henry, please tell us how you find so many interesting things for your stories.
Problem: M: He bought a history book,but the English textbook was sold out. What was said before this conversation?

A: W: Has your brother bought this book yet?
Problem: Given the question: W: Oh, hi, Jack. Yes, I'm still working part-time in a company, as much as I can. The trouble is that I'm so busy with my classes that I don't have enough time for my work. M: Do you have a lot to do? W: Well, not too much at the moment. M: Are you going to go on working in that company? W: I hope so. I really like my work, and next term, I will have more time. M: Sounds good. Hope I'll see you around here more often. W: OK. I hope to see yon too. Bye for now. What was said before this conversation?
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The answer is:
M: Hi, Ann. Are you still working here?
input question: W: Yes? M: Could you tell me the way to People's Park? W: Yes. Go down this road. Turn right at the third crossing. Walk until you see a school. It's just opposite the school. M: It sounds like quite a distance. W: Yes, about half an hour's walk. M: Can I take a bus there? W: I'm afraid not. But you can take a taxi. M: That's a good idea. Thank you very much. W: It's my pleasure. What was said before this conversation????
output answer: M: Excuse me, please.
input question: W: Did you have something special in mind? M: No, not really. I just thought it might be fun to do something new. W: Doing something for a change, you mean? M: Yes, something different. I need a change. W: I usually go shopping and have my hair done during the weekend and you usually watch the football games on TV. M: Yes, you often have tea with your friends. And I sometimes play cards with my friends. We seldom do anything together. It's quite unlike when we were first married. W: Now I've got an idea. Autumn is the best season in Beijing. Why don't we go for a picnic this weekend? You'll invite your friends and I'll invite mine. We'll go together. M: Good idea! I'd see about the car and you'll prepare the food. But are you sure you really want all our friends to come along? What was said before this conversation????
output answer:
M: What shall we do this weekend?