What has many keys but can’t open a single lock?

If you say my name, I will no longer exist. What am I?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

The more you take me, the more you leave me behind.
Who Am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

I don't get anymore wetter, no matter how much rain falls on me.

What word begins and ends with an E, but has only one letter?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?