In this task, you're given the title of a five-sentence story and the first four sentences. Your job is to write the last sentence of the story such that it seamlessly connects with the rest of the story.

Title: Bad Grades. Sentence 1: Robert was doing very badly in school. Sentence 2: All his grades online showed that he had D's and F's. Sentence 3: It turned out he hadn't been doing his homework at all. Sentence 4: Robert's parents were so mad that they grounded him.
Once his grades are a lot better he won't be grounded anymore.