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: Cassie was on a church girl's trip. Sentence2: The girls were canoeing a local river. Sentence3: Cassie had a really hard time with the paddles. Sentence4: She tried her best to keep up, but she couldn't.

Luckily everyone was very understanding.