Please choose the correct ending to complete the given sentence: Skateboarding: A teen explains how to flip and turn a surfboard with the feet. Then, the teen shows how to rise the tips of the surfboard. then

Ending1: , the teen flips the surfboard and turns it to a horizontal position, then it turns to flip the surfboard. Ending2: , the teen call the parents to come to the teen's room while the teen is demonstrating. Ending3: , the teen stands on the surfboard and demonstrates how to turn it to the side. Ending4: , the teen balance the board break on the middle and flip it as well.

Answer format: ending1/ending2/ending3/ending4