I taste better than I can smell. Who am I?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What do you answer even though it never asks you questions?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

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?

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