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: Ben walked along the street and found the end of a length of string. Sentence2: He picked it up and pulled on it. Sentence3: More string came but not the end. Sentence4: Ben followed the string to see where it went.

Ben was fascinated by the string.