Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: For the first one, he has the ball on the end of the tennis racket that is upside down, he jilts the tennis racket up and hits the ball while it is up in the air. once that

Ending1: is tied, he throws it down for a while and has it firmly in his hand before the next attempt. Ending2: is in the air, the ball comes down flipping over backward and the person immediately picks it up and throws it back, while someone else is giving it to him for his turn. Ending3: is successful, more tricks follow and he does other things such as spinning, behind the back, and juggle serves. Ending4: is arranged, he tries again but he hits it and reaches his arms up in the air.

Answer format: ending1/ending2/ending3/ending4