What has one letter and starts with an E?

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 the fastest animal but cannot climb the tree. What am I?

Why 1729 is a magic number? Answer Logically.

Give it food and it will live; give it water and it will die.

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

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?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?