What is the longest word in the dictionary?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

What goes through cities and fields, but never moves?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Can you find out the missing number in the grid?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?