Please choose the correct ending to complete the given sentence: Assembling bicycle: Then he uses his hands to remove the axle out. He uses another tool to unscrew a washer out of the axle. then he

Ending1: starts to new the tire. Ending2: takes a spool from the basket and ties the nut back into place. Ending3: uses a hose to clamp the nut back in place. Ending4: uses a tool with a magnetic end to remove tiny metal particles out of the axle.

Answer format: ending1/ending2/ending3/ending4