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

John was piloting a plane behind a car but was never able to overtake it. Why?

Which point will the car reach to go out?

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

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

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

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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

What is more useful when it is broken?

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?