Answer:
Without a bridle or a saddle across a thing I ride a-straddle. And those I ride by help of me though almost blind are made to see.
I am there when you sit, but gone when you stand. What am I?
Poor people have it. Rich people need it. If you eat it you die. What is it?
Whoever made me doesn't want me. Whoever bought me doesn't need me. Whoever uses me doesn't know me. What am I?
I'm light as a feather yet the strongest person can't hold me for more than a few minutes. What am I?
What language does a billboard speak?