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: My boss pulled me aside at work. Sentence2: I thought he was going to tell me Happy Birthday. Sentence3: Instead, he told me I wasn't needed today. Sentence4: I sulked home, not sure whether I was getting fired or not.

When I arrived home, I walked into a surprise birthday party!