(浙江卷8). The experiment shows that proper amounts of exercise, if __ regularly, can improve our health.
This is an illness that can result in total blindness if_______.
The dying old man opened his mouth as if_______something.
—Why do you want the book so much? —_______, sir.
—I hate talking with that guy. Look, he is coming. What should I do? —Don’t speak until_______.
I don’t know if you noticed their absence or not, but we ________.