Can you find the missing piece of the Porsche?

I know a nine-letter word having only one vowel.
Do you ?

Do You See It?

How many letters are in the alphabet?

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

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

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. 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?

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?