Answer:
You buy me to eat, but never eat me. What am I?
Railroad Crossing, look out for the cars. Can you spell that, without any R's?
I run up and down the stairs without moving. What am I?
I get wet when drying. I get dirty when wiping.
I produce wool and spit a lot
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.