Please choose the correct ending to complete the given sentence: Fixing bicycle: A man is inside a work shop. He is working to replace the tire on a bike. he

Ending1: fixes the bike on the bicycle. Ending2: removes the rubber tread and replaces it. Ending3: 's showing how to turn the handles so he doesn't have to use the handle. Ending4: is standing in front of the seat of the bike and putting screws up onto its handle bars.

Answer format: ending1/ending2/ending3/ending4