Detailed Instructions: 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.
Q: 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.
A:
Jay rewarded Rex with a treat for his obedience!