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 the kind of a tree that is carried in your hand. What am I?
I make everyone blind. You can't see me but I will always come back for you. What am I?
I am easy to see, but no one likes looking at me. Without me, there would be no you. What am I?
I am always hungry, I must always be fed. The finger I lick will soon turn red. What am I?
I flow from the Homerβs mouth when he sees doughnuts.