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: Sara was walking in front of her high school. Sentence2: Her best friend called to her from down the road. Sentence3: Sara excitedly started running toward her friend. Sentence4: As she ran, her heavy backpack bounced against her.

She ended up tripping and falling on the sidewalk.