Logic Riddle

Question: What are the next two letters in the following series and why? WATNTLITFS__

Question: You are in a car with your friend and your car ran out of gas. You went to the gas station to go pick up some gas. You told your friend to close all the windows and don't turn the radio on. Your friend turned the radio on and the radio was the news reporting there is a murderer in town. Your friend looked up and saw the murderer. The murderer killed your friend. How is this possible?

Question: Which eight-letter word still remains a word after removing each letter from it?

Question: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: What does a TV stand for?