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: Mountain Bike. Sentence 1: Gary went into the mountains. Sentence 2: He brought his bike. Sentence 3: He rode it down the mountain. Sentence 4: He hit a branch.
His bike broke down.