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: Charles was 10-years-old when his uncle took him skiing. Sentence2: He suited up, buckled his skis, but the guys skied off! Sentence3: Charles began sliding backwards down a slope. Sentence4: He skied faster and faster, knocking people down in his path.

A guard stopped Charles and then said he must be a professional.