[Q]: W: My car is in the repair shop and I have to pick it up. You go ahead and I'll meet you there. What was said before this conversation?
****
[A]: M: Hi, Lisa. Shirley and I are going for a drink after work at the usual place. Would you like to come along?
input: Please answer the following: M: You are welcome. Happy landing. What was said before this conversation?
++++++++++
output: W: Flight 331 is being announced. I'd better be on my way. Goodbye. Thanks for all your kind hospitality.
Please answer this: M: Well. They've got a lot of sentimental value for me, and that's all about it. What was said before this conversation?
++++++++
Answer: W: Wow, look at all these old books on this shelf. They've got to be at least one hundred years old. I'll bet they're worth a lot to collectors.
Problem: W: Oh yes, it is. Thank you. I was looking for it just now. M: You look a bit familiar to me. I wonder if we have met somewhere before? W: Have we? M: May I ask where you live? W: Just two blocks away, in that tall building. M: That's it. I live there too. I am on the 8th floor. W: It's a small world. We live on the same floor. M: I'm Adam Smith. May I know your name? W: I'm glad to know you. Mr. Smith. I'm Lily Brown. What was said before this conversation?

A: M: Is this your umbrella, Miss?
Problem: Given the question: M: Post office? It's not far from here. Do you know Xinhua Road? W: I'm from the United States and this is my first trip to your city. I know nothing about the city. M: Oh, welcome to our city, I'll show you the road. Please follow me. W: Thanks, by the way, where can I buy a map of the city? M: Just at the gate of the post office. Look, the post office is just across the street. W: Thank you very much. Good-bye. M: Good-bye. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
W: Excuse me, could you tell me where the post office is?
Problem: W: It was built in 1944. M: Is it the same as the computers that we use now? W: No, it was as large as a room and worked very slow. M: But computers have become smaller, and worked faster now. W: Yes. Most computers are as small as a TV set. Some can be made smaller than a book. M: Why is a computer so useful? W: It can keep much information and work very fast. M: Then they can do a lot of work for us. W: You are right. They have greatly changed our lives. What was said before this conversation?

A:
M: When was the first computer built?