Answer:
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
I go around in circles, but always straight ahead. Never complain, no matter where I am led. What am I?
I am a fruit with seed on the outside. What am I?
I have a hundred legs, but cannot stand. I have a long neck, but no head. I cannot see, and I'm neat and tidy, as can be. What am I?
I belong to you but others use me more often than you do
No matter how little or how much you use me, you change me every month.