Please choose the correct ending to complete the given sentence: Assembling bicycle: Two men are assembling a bicycle on a stand. They put the tires onto the bike. They put the pedals on the bike. they

Ending1: adjust the handlebars on the bike. Ending2: finish assembling the bike. Ending3: put the tires on the bike. Ending4: sit on the bike and adjust the wheels.

Answer format: ending1/ending2/ending3/ending4