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: The lion trainer opened the lion's' cage. Sentence2: He brought one of the lions into the center ring. Sentence3: He began the exercises as he had so many times before. Sentence4: A metal wheel on the groundskeeper's cart squealed suddenly.

The startled lion mauled its trainer, instead of doing its exercises.