Answer:
What is seen in the middle of March and April that cannot be seen at the beginning or end of either month?
I am what one cannot keep, two cannot hold, and three cannot destroy. What am I?
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
I go around a yard but does not move.
I am filled with garb the price is free. Just return what you don't need.
Sometimes I am white, sometimes I am dark. Most people love me. What am I?