Please choose the correct ending to complete the given sentence: Fun sliding down: A little boy playing on a jungle gym. He is climbing up a set of stairs. now

Ending1: he runs up even higher and climbs to the top again. Ending2: he is at the top and he starts climbing all the way up again. Ending3: is sliding fast down a slide. Ending4: , he is being pulled up the sliding slide and on to another set of stairs.

Answer format: ending1/ending2/ending3/ending4