What begins with T, ends with T, and has T in it?

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?

Why is a river so rich ?

Why is the longest human nose just 11 inches?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

What kind of band never plays music?

Why is Saturday stronger than Monday?

I am sure no one can have two things for dinner. what are they?

Can you start the fire using two pieces of wood?