Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to learn auto mechanics [title] Recognize the extent of knowledge and skill that an auto mechanic should retain. [step] This way you will not be surprised in the midst of your instruction. Mechanics must have vast knowledge in adjusting, repairing, maintaining and testing all the mechanisms of a car.

Ending1: Be sure that you don't overlook work that you should be learning. As a professional you shouldn't put it off indefinitely. Ending2: [title] Commence your auto repair training by completing your high school education. [step] A high school diploma provides a basic foundation upon which you can build your career in mechanics. Ending3: Assess the intelligence gained by learning about auto mechanics from experts and teachers. [title] Learn about motor controls and its functions. Ending4: These are vague expressions that commonly use terms such as " transmission, " " engine, " " braking, " or " wheel placement. " [substeps] Not all of the words and words imply specialized knowledge.

Answer format: ending1/ending2/ending3/ending4