Given the task definition and input, reply with output. 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: Karen was assigned a roommate her first year of college. Sentence2: One day, her roommate asked her to go to a nearby city for a concert. Sentence3: Karen agreed happily. Sentence4: The show was absolutely exhilarating.
Karen became good friends with her roommate.