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: Mason was excited to open his new insurance office. Sentence2: He had worked very hard. Sentence3: He cut the ribbon and opened for business. Sentence4: On his first day he had many clients.

Mason was sure his business would be a success.