What has one letter and starts with an E?

What is more useful when it is broken?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

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?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

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.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?