M: Tile wild-life project needs money. What was said before this conversation?
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Answer: W: Hi,Gsry. What are you trying to collect money for?

M: No. He's at the lab, but he will be back home at four o'clock. What was said before this conversation?
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Answer: W: Hello. This is Violet from the Rainbow Hotel. Is Wallace at home?

M: I'm sorry. The train is behind schedule. You have to wait another twenty minutes. What was said before this conversation?
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Answer:
W: Excuse me. Do you know when the train will arrive?