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?

What is the word or phrase?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What has hands, but can’t clap?

Different lights make me strange by changing me into different sizes. What am I?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

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?

Count the number of triangles in the picture below:

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?