Please choose the correct ending to complete the given sentence: Doing motocross: We see small kids ride bmx bikes on a dirt track in an arena. The kids ride past the camera. the kids

Ending1: stop a while and walk the grassy area of the arena. Ending2: start passing the finish line. Ending3: play on a dirt track. Ending4: continue to ride in their dirt bikes.

Answer format: ending1/ending2/ending3/ending4