－Julia, _________will your son return?－In a week. 

It is impossible that you achieve your goal without effort,         ?

----I called him twicw and I couldn’t get through to him.----The line might have been out of order,_____?

You look very tired and you must have been preparing for the coming examination yesterday evening, _________ you ?

—Nothing wrong with it, ____________?— Yes. The computer says, “Please check this disk before entering data.”