Answer:
I carry you down a gentle stream.
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
A hundred arms, a thousand fingers, but I have no eyes to see where I linger. What am I?
As a state in the USA, I am round on both sides and high in the middle. What am I?
Everyone has me and no one can lose me. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.