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

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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

Which letter of the alphabet has the most water?

Find the value of "?" in the ball picture Riddle below:

Who has married many women but was never married?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Why is the Hole below a Lock?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?