Please choose the correct ending to complete the given sentence: Welding: A boy makes repairs to a disassembled bicycle with the use of a solder in a backyard near the back steps of a house. a boy

Ending1: uses a wrench to repair a pair of bicycle wheels by pressing down on the rims using the knife. Ending2: cracks a bottle of detergent and kraft iron. Ending3: enters the scene and pulls on a pair of gloves while wearing a sports protective mask, turns on a blue machine on the back steps and picks up a solder. Ending4: watches a young boy assemble the bike, extracting the solder from its disassembled parts.

Answer format: ending1/ending2/ending3/ending4