Please choose the correct ending to complete the given sentence: Doing kickboxing: A boy in an orange shirt is standing in a room. He starts punching a punching bag. the punching bag

Ending1: falls over onto the ground from exhaustion. Ending2: opens up and a boy punches it. Ending3: moves in the air. Ending4: moves up and down on a table.

Answer format: ending1/ending2/ending3/ending4