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.

Sentence1: The student ahead of Samuel on the steps was walking very slowly. Sentence2: Samuel became irritated at his slow pace. Sentence3: He yelled at the student to move faster. Sentence4: Then he realized the student was blind.
Samuel felt foolish and ashamed.