Problem: Given the question: B: That's true. But it gets really noisy at night. What was said before this conversation?
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The answer is:
A: I really like living here in this flat, because it's so near the center of town.

Problem: Given the question: M: I want to be a nurse. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
W: What is your dream, Linda?

Problem: Given the question: M: We might as well spend 300 dollars more to buy a new one then. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
W: The mechanic said it would cost 300 dollars to have the car repaired.