Please choose the correct ending to complete the given sentence: Doing karate: . a boy and girl in a karate uniform

Ending1: come running down a street. Ending2: are playing in front of a camera. Ending3: attack each other in a karate park on a playground in a concrete ring. Ending4: gently glide down a long middle with their great opens arm extended and then taunt and then duck and then advance while doing their karate routine in an upward motion.

Answer format: ending1/ending2/ending3/ending4