Answer:
Brown I am and much admired. Many horses have I tried. Tire a horse and worry a man, tell me this riddle if you can. What am I?
What five-letter word becomes shorter when you add two letters to it?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
What has roots that nobody sees and is taller than trees. Up up up it goes and yet never grows?
No matter how hard you hit me, no matter how much I hurt, I'll always go for a laugh. What am I?
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.