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: Tia was hiking one day. Sentence2: She suddenly grew very thirsty. Sentence3: Her water jug was empty, so she drank from a nearby stream. Sentence4: But soon her stomach was cramping horribly!

Tia realized she shouldn't have drank the untreated water.