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: Allan's dog started chasing a neighbor's cat. Sentence2: He chased the cat into the busy street! Sentence3: A car struck and injured both of them. Sentence4: Allan rushed his dog to the vet for treatment.

His dog had to wear a leg cast for weeks.