— Could you give _______ an introduction to the new machine?— Of course. I will tell you how to use it. 

In ______________, fashions changed and many factories closed down.

Mr. Johnson always carries a notebook, in which he _______ everything that happens.

In that big fire all their houses were______, so they had to build new ones. 

It’s ______ that the boy break away from the bad habit of sleeping at class.