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: Pearl collected CDs with ugly cover art. Sentence2: She prized a jazz CD with two dolphins photoshopped together. Sentence3: Her sister stole the CD while angry with her. Sentence4: Pearl's heart sank and she implored her sister to return it.

Pearl's sister was seeking revenge.