A competent speaker of a language must have a(n)________ of these different styles.
Because of the heavy snow, we had to delay the visit until this weekend to the artgallery ____ in the center of our city these days.
While watching television, ____.
I’ll have all of the readings ____ by the end of this term if my plan goes well.
—How did it come that you damaged your car so badly? —I ____into a tree on the roadside the other day.
Air pollution, together with littering, ____ many problems in our large industrial cities today.