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 am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

What breaks yet never falls, and what falls yet never breaks?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

I have an eye but still cannot see.

Who am I?

During which month do people sleep the least?