Please choose the correct ending to complete the given sentence: Fixing bicycle: The man shifts the seat of a bike. The man uses the object from the table to tighten the seat of the bike. the man

Ending1: checks the bike seat for looseness. Ending2: places the tire on the frame of the bike. Ending3: uses the object from the table to tighten the seat of the bike clipped to the surfboard. Ending4: uses the object from the table to tighten the seat.

Answer format: ending1/ending2/ending3/ending4