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 am of several different kinds, but the one you pick doesn't do its job. What am I?
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
I have a neck but no head. I have a body but no arm. I have a bottom but no leg. What am I?
I am full of holes but still holds water.
What did the grape do when he got stepped on?