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: Khalid was in Nepal hunting for the Abominable Snowman. Sentence2: He saw footprints in the snow and followed them to a cave. Sentence3: He listened closely, but only heard silence. Sentence4: As he started to leave, he heard a deafening roar from the cave.
Khalid took off running, deciding he didn't want to see the monster.