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: Anna was hiking in the hills behind her home. Sentence2: She was scaling the large boulders. Sentence3: Then she slipped and fell. Sentence4: She snapped her ankle between two boulders.

Anna had to return home for treatment.