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 has never been on a rollercoaster. Sentence2: Rob's friends offered him a free ticket to six flags. Sentence3: Rob decided he may as well join. Sentence4: They all went and waited a long line.

Rob had generous friends.