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.

Sentence1: Bobby hadn't checked under his bed in quite some time. Sentence2: It was time to clean his room so he looked under it. Sentence3: As well as shoes he found something big and fluffy. Sentence4: At first he wasn't sure what it was.
Then he realized it was the biggest dust bunny he'd ever seen.