What's the only room from which no one can enter or leave

Can you find out which options fits best with the missing column?

I can write cow in 13 letters.

Can You?

How many triangles can you count in the figure given?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

How many words can a pen with half refill write?

I know a nine-letter word having only one vowel.
Do you ?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?