What goes up but never comes down?

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

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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?

A fresher was sitting in an interview. The interviewer said, "This is the last question of your interview. Tell me the accurate position of the centre of this table where your resume is kept."

How can he answer this question? What will you have answered to such a question?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

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

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

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