What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?

Take one out and scratch my head, I am now black but once was red. What am I?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?