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: Loni was very worried about her cat. Sentence2: It kept coughing and making strange noises. Sentence3: She was going to take it to the vet. Sentence4: However, the source of the cough was quickly found.

The cat coughed up a gross hairball.