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: Billy was staring at the girls for several seconds. Sentence2: Jim sneaked behind him. Sentence3: He pulled Billy's underwear out of his pants. Sentence4: Billy fell down on the ground.

The girls looked at him and started to laugh.