To a doctor, the most important thing is _______. A. to save b. saving C. to saving D. saved
As we all know, improving one's reading ability _______ speed and comprehension.
You _______things about. Look, what a mess in your room!
As far as I am concerned, English can be _______a useful tool rather than just a language.
They really have a great time too, designing everything, drawing the blue prints, _______the angles(角度)and so on.
He failed in English once again, but he didn't _______ as if nothing had happened.