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.
Input: Sentence1: Tom wanted a Chemistry set for Christmas. Sentence2: His mom said it was too dangerous for a little boy. Sentence3: Tom asked for a puppy instead, and his mom suddenly changed her mind. Sentence4: Tom didn't understand why, but he didn't care.
Output:
He was happy to get the Chemistry set.