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

(a)  

The more you take, the more you leave behind. What am I?

(a)  

What has keys but can't open locks?

(a)  

What has a head, a tail, but no body?

(a)  

What comes down but never goes up?

(a)  

I fly without wings. I cry Without eyes. Whenever I go, darkness flies. what am I?

(a)  

What has one eye but can't see?

(a)  

What have an endless supply of letters?

(a)  

I am tall when I am young and short when I am old. What am I?

(a)  

I am taken from a mine, and shut up in a wooden case, from which I never released, and yet I am used by almost every person. Who am I?

(a)  

The person who makes it, sells it. The person who buys it never uses it. The person who uses it never knows they're using it. What is it?

(a)  

What has to be broken before you can use it?

(a)  

What comes in many different colors but it always green?

(a)  

I'm not alive, but I grow, I don't have lungs, But I need air, I don't have a mouth, but water kills me. What am I?

(a)  

What has a neck but no head?

(a)  

What is full of holes but still holds water?

(a)  

What is always Infront of you but can't be seen?

(a)  

What has many keys but can't open a single door?

(a)  

What belongs to you, but other people can use it more than you do?

(a)  

What has hands but can't clap?

(a)  

What is so fragile that saying its name breaks it?

(a)