Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

You can see it everyday, But cannot touch it at will. What is it?

I have teeth but i don't bite. Who Am I ?

It is always ahead of me yet I can never see it. What is it?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

There is something which is always coming but never arrives?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?