I am a seven-letter word but if you remove four of my letters I will have one left. What word 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?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

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

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

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?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?