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

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

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?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

What is always in front of you but can’t be seen?

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

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

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

What English word has three consecutive double letters?

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