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?
My teeth are sharp my back is straight to cut things up it is my fate.
Every night I'm told what to do and each morning I do what I'm told. But I still don't escape your scold
I will disappear every time you say my name.
If you have me, you want to share me. Once you share me, you won't have me. What am I?
What bird can lift the heaviest weight?