What month of the year has 28 days?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Which point will the car reach to go out?

What is the riddle which can be asked all day with a different correct answer each time.

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What you cannot hold but it is yours?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?