Kelly: My hobby is piano and drawing because piano is exiting.
Correct: My hobby is playing the piano and drawing, because playing the piano is exciting.
Explanation: The sentence is correct. But kindly, consider the use of appropriate words and check the spelling of the words [EXCITING].

Hello Kelly! Very good! You always did your homework. Keep it up! Just always be motivated to learn more. Read English books more often, that way it's easy for you to express yourself using the English language. I know that you can do it. Good job!

Love,
Teacher Belle. :)