Please choose the correct ending to complete the given sentence: Skateboarding: A young man skateboards in the street, then enters in a shop. young men

Ending1: skateboard in different parts of a city. Ending2: is skateboarding in small and crowded streets. Ending3: are kayaking through river. Ending4: are skateboarding in building, physics lab, medical building, glass doors, on tube.

Answer format: ending1/ending2/ending3/ending4