I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

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?

How many letters are in the alphabet?

What demands an answer, but asks no questions

How many times can you subtract the number 5 from 25?

What have one eye but still cannot see?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?