Definition: In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.
Input: Sentence1: Derek loved exploring caves. Sentence2: He had been to most of the famous caverns in North America. Sentence3: He particularly liked caves with gemstones in the walls. Sentence4: Derek became a park ranger at a cave system.

Derek developed an interest in mountains after his long time in caves.