What is always in front of you but can’t be seen?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

People put me on the table and cut me but do not eat me. What am I?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

You can see it everyday, But cannot touch it at will. What is it?

How can you leave a room with two legs and return with six legs?

I taste better than I can smell. Who am I?

What word is pronounced the same if you take away four of its five letters?