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: Rob was at a grocery store. Sentence2: And he wanted to buy coffee. Sentence3: He looked at the ground coffee that he usually buys. Sentence4: But he saw another brand on sale.

When he tried the coffee at home, he realized why it was on sale.