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: Amy came home from school on her birthday to an empty house. Sentence2: She was upset that everyone had forgotten her special day. Sentence3: She walked sadly into the living room. Sentence4: Suddenly, her friends and family jumped out from their hiding spots.

Amy grinned with delight.