Given the task definition and input, reply with output. 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.

Sentence1: Fred listened to the radio as she drove home. Sentence2: The radio announcer said that the big one was coming. Sentence3: Fred drove quickly home once he heard this. Sentence4: He ran from his car into his bomb shelter.
He bolted the door behind him and waited for the big one to come.