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: Bob was playing catch with his dog. Sentence2: Bob threw a tennis ball. Sentence3: The tennis ball landed in a pond. Sentence4: His dog swam in the pond to retrieve the ball.

Afterwards, Bob had to dry his dog with a towel.