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: Karl got a call from the library. Sentence2: They claimed he had a book out. Sentence3: He remembered returning it. Sentence4: After looking around he found it behind a sofa.

He apologized and returned it.