Answer:
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
A blue man lives in the blue house. A red man lives in the red house. Who lives in the white house?
People in love are often bound to this.
No matter how little or how much you use me, you change me every month. What am I?
Man's most important invention.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.