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: Jen brought her cat Lee to the vet for a checkup. Sentence2: The veterinarian, Doctor Mike, found three fleas on Lee. Sentence3: Doctor Mike suggested a flea dip to Jen. Sentence4: Jen refused because she did not want Lee to be dipped in chemicals.

Jen noticed that Lee's flea problem quickly got worse.