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?
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
I am round as an apple, deep as a cup. All the King's horses can't pull me up. What am I?
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I’ve told you all I cannot tell you more.
I'm an animal. I love marching. I always wear a tuxedo. What am I?
What never gets any wetter no matter how hard it rains?