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: Dave walked into the grocery store. Sentence2: He was going there to buy his favorite energy drink. Sentence3: He only had enough money to buy one can. Sentence4: He reached the aisle and what he saw made him smile.

They were on sale.