Answer:
I am not alive but I can die. What am I?
Cold head and feet; round as a ball; always turning around myself.
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?
If you're looking for something sweet I know what to do. But if you don't like heat I'm not for you.
What is full of holes but still holds water?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.