There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

I always drive my customer away.

Who am I?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Solve below rebus puzzle?

What is the longest word in the dictionary?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

What number when divided in half becomes zero?