Answer:
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
I work when I play and play when I work
I am owned by the poor the rich does not need me. If you eat me you will die!
I am made of wood but can't be sawed? What am I?
I am the building with the most number of stories. What am I?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.