Example:
Where are you parking?
I am parking near here.

What........ at the moment?
I am writing a test.

Which ...................?
I am doing exercise 1.

.........................................
No, nobody is helping me.

Which.........................?
Well, I am making question 3.

........your friends ..............?
no,the are not making question 3.

and what.................now?
i'm sorry , i don't know what they are doing?​