There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I am quite hot but become too cold if you remove the first two letters. What am I?

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

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

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

What word begins and ends with an E, but has only one letter?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?