Answer:
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around
Sitting down you have it, Standing up you don't.
This is a shape and a symbol that we literally cannot live without. What is it?
No matter how little or how much you use me, you change me every month. What am I?
What leaps one time out of four?
What did the piece of wood say when he saw the screwdriver and screws approaching?