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: Cassidy feels sad that he may never have children. Sentence2: However, he hasn't met a woman he wants to have kids with. Sentence3: A friend recommends he try adopting a son instead. Sentence4: He adopts a son and becomes a great father.

Cassidy is very happy that he became a father.