Answer:
What can you hold in your left hand but can never hold in your right hand?
What is something that can go up quite easily, but is not as easy to bring back down?
What flies forever, rests never?
How do you spell hard water with only three letters?
What is filled with air and sometimes a gas, tied to a string and often seen on your birthday?
What never gets any wetter no matter how hard it rains?