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: Bob got a rubix cube for Christmas. Sentence2: He struggled to solve the puzzle. Sentence3: Eventually, he was able to solve half of it. Sentence4: But, the full solution remained elusive.

Bob worked hard and then finally solved the puzzle.