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?
Iron roof, glass walls, I burn and burn but never fall. What am I?
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
I help boats park
I love spinach.
I tell people to be careful when handling boxes.