Please choose the correct ending to complete the given sentence: Assembling bicycle: A person tightens the holds on the handlebars. The man puts grease on the paddles and installs them before airing the tires. we

Ending1: see the tires, and see the tires behind the gear. Ending2: then see the finished bike. Ending3: see a rental ad for a machine. Ending4: see the tailed runner in a lake.

Answer format: ending1/ending2/ending3/ending4