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: The teacher announced that there would be a pop quiz. Sentence2: The students let out a collective groan. Sentence3: This was the second pop quiz in a week. Sentence4: As the teacher began handing out the quizzes, the fire alarm rang.

The students cheered because they were free.