Answer:
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 am a king who's good at measuring stuff. What am I?
When you need me, you must find me. When you find me, you no longer need me. What am I?
The more you work the more I'll eat.You keep me full I'll keep you neat.
I am a key that is playful. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.