Answer:
I go up and down at the same time. Up towards to sky and down towards the ground
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
You throw me out when you use me and take me in when you are done. What am I?
What language does a billboard speak?