Answer:
kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all.
I take off my clothes when you put on your clothes. I put on my clothes when you take off your clothes. What am I?
I am a way to say goodbye to your sweetheart
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
I am alive without breath and cold as death. I am never thirsty but always drinking.
No matter how little or how much you use me, you change me every month.