Rack your brains

David's father has three sons: Snap, Crackle, and _____?

If you were alone in a dark cabin, with only one match and a lamp, a fireplace, and a candle to choose from, which would you light first?

I have 5 apples and I take away 3. How many apples do i have?

What is it that lives if it is fed, and dies if you give it a drink?

What has a head, a tail, but does not have a body?

There are ten birds perched on a fence. A farmer aims his rifle and shoots one. How many birds are left?

I have teeth but I can’t eat. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What comes once in a minute, twice in a moment, but never in a thousand years?

I start out tall, but the longer I stand, the shorter I grow. What am I?