Teacher: In this task, we ask you to write an answer to a question about the events that may happen before or after a certain event. For example, "earning money" usually appears before "spending money". Note that a lot of the questions could have more than one correct answer. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Sentence: Jack played basketball after school, after which he was very tired. 
Question: What did Jack do after the game?
Solution: He rested.
Reason: When people "get tired", they usually "rest".

Now, solve this instance: Sentence: As winter approaches, some plants respond by their leaves changing color. 
Question: What season comes before winter?
Student:
fall.