Please choose the correct ending to complete the given sentence: Fixing bicycle: A young man pulls a wheel out and shows the proper structure of a wheel. He checks the current pressure for the tire and begins pumping air into the tire. he

Ending1: takes a second turn and pumps air into the brakes and clips the handle bars. Ending2: smooths out the tire and balances the wheel using a tool. Ending3: pulls back on the wheel and continues pumping air into the wheel. Ending4: shows the difference between good tread and bad tread as well as when to know when to replace your tires.

Answer format: ending1/ending2/ending3/ending4