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 really wanted a pet for Christmas! Sentence2: But his mom was allergic to cats and dogs. Sentence3: And his dad was afraid of lizards and snakes! Sentence4: On Christmas morning, Bob wasn't very hopeful.

But there, under the tree, was a big new fish tank!