Answer:
I can fall off a building and live, but in water I will die. What am I?
What language does a billboard speak?
Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot. All is cool where it is not. What is it?
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
I start with an E end with an E and have a letter in me.
No matter how little or how much you use me, you change me every month.