I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Which is the rope you never skip with?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Can you name four days which start with the letter 'T'?

The answer I give is yes, but what I mean is no. What was the question?