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

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

There is something which is always coming but never arrives?

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?

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?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

It belongs to you, but other people use it more than you do. What is it?

What can you catch but never throw?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.