What is at the end of a rainbow?

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 name some countries which do not have the alphabet 'A' in them?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

People put me on the table and cut me but do not eat me. What am I?

What has 88 keys?

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

What goes up but never comes down?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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