Answer:
I am a precious stone as clear as diamond. Seek me out while the sun's near the horizon. Though you can walk on water with my power try to keep me and I'll vanish in an hour.
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.
I have a straight back and sharp teeth to cut objects.
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?
You can see me in water, but I never get wet. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?