That’s the new machine _______ parts are too small to be seen.

$100 will allow a woman ________ is a trained tailor to make some income, ________ her and her family a better future.

 At the beginning of a speech, it is very important to grab the audience’s attention and make them interested in     ________you have to say.    

As a teacher, I seldom give my students so difficult a problem_______ they can’t work out.

—The experiment is of particular importance.　　　　—I see. We will carry on with it ________ we can get enough money.