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: Jay was training his new dog Rex. Sentence2: He taught Rex to sit, roll over, and beg. Sentence3: At first Rex did not respond. Sentence4: But gradually he grew better and better.

Jay rewarded Rex with a treat for his obedience!