Given the task definition and input, reply with output. 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: Sarah had always had a hard time paying attention in school. Sentence2: When she went to high school, it became even more noticeable. Sentence3: Her grades were very low. Sentence4: She realized she needed to do something about it.
She went to a doctor and was diagnosed with ADHD.