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: A man walked down the street with a cane. Sentence2: The cane got stuck in a crack and the man fell. Sentence3: The fall caused the man to land on his shoulder. Sentence4: His arm popped out of his socket.

The man dialed his phone for help because he couldn't rise.