We haven’t settled the question of __________it is necessary for him to study abroad.
| A．if | B．where |
| C．whether | D．that |
This is an illness that can result in total blindness if_______.
| A．to leave untreating | B．left untreated | C．leaving untreating | D．is left untreated |
The dying old man opened his mouth as if_______something.
| A．to say | B．saying | C．to have said | D．was saying |
I wonder why you won’t do it as_______. Its the third time you have done so.
| A．told to | B．be told | C．told you | D．you told |
—Why do you want the book so much?
—_______, sir.
| A．Studying | B．Studies | C．Studied | D．To study |
—I hate talking with that guy. Look, he is coming. What should I do?
—Don’t speak until_______.
| A．speaking | B．spoken to | C．spoken | D．speaking to |