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. What am I?
The more you take of me the more you leave behind.
I get paid to shoot people then blow them up.
You throw me out when you use me and take me in when you are done. What am I?
I am an object which is used in baseball. During the day I can't be seen at all. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.