Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to ride a mini chopper in a safe way [title] Keep your mini chopper in good working order. [step] This will not only make the bike safer, but will also improve its performance. [title] Wear protective gear, including a helmet and pads for elbows and knees.

Ending1: [title] Make sure you have sharp edges (e.g. [step] Knives and scissors do not get in the way). Ending2: [step] Safety goggles will help to prevent accidental hit-and-run. [title] Ride with the front engine turned off. Ending3: [title] Before you start riding, make sure everything is all set. [step] Checking for weak points or missing devices make sure the blades are in good working order (and thus, that there are no dings or dents. Ending4: [title] Mini chopper riders should be at least 12 years of age. [step] If younger, parents need to be extremely careful and supervise their children at all times.

Answer format: ending1/ending2/ending3/ending4