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

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know 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?

Can you write down eight eights so that they add up to one thousand?

What breaks yet never falls, and what falls yet never breaks?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

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?

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

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?