Q: W: Ok, it's about 500 km farther than from Guangzhou to Shanghai. What was said before this conversation?
A: M: It's about 2300 km by train from Guangzhou to Beijing.

Q: W: What a terrible memory you have! Anyway, I won't need it until Friday night. As long as I can get it by then, OK? What was said before this conversation?
A: M: Oh, I'm so sorry I forgot to bring along the book you borrowed from the library.

Q: M: I might have won if I listened to my coach. What was said before this conversation?
A: M: It's a shame that you didn't win your tennis match.

Q: W: Oh, Julia invited her friends over in the afternoon and they ate it all. What was said before this conversation?
A:
M: I'm starving. Do we still have any pie left from the dinner yesterday?