What begins with T, ends with T, and has T in it?

Find the missing letter in the last circle logically in the given below picture.

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

What's a single-digit number with no value?

Why do we preferably have round manhole covers and not square ones?

Can you count the number of triangles inside a triangle?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

If a wheel has 54 spokes, how many spaces are there between the spokes?

I have an eye but still cannot see.

Who am I?