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: Sal and Betty were on a boat in a swamp. Sentence2: The water was thick and cold. Sentence3: Gators and snakes were in the water too. Sentence4: Betty wanted to go back and get out of the water.
Sal refused and paddled forward, and they were never seen again.