Answer:
What does everyone know how to open but not how to close?
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.
I am cracked by Indiana Jones. What am I?
No matter how little or how much you use me, you change me every month.
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
What language does a billboard speak?