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: Juan and his father were doing yard work outside. Sentence2: But their lawn mower stopped working. Sentence3: Juan's father couldn't fix it. Sentence4: The lawn mower turned out to be defective.

And they got a free refund and a future discount.