Someone is ringing the doorbell . Go and see ______?
| A．who is he | B．who he is |
| C．who is it | D．who it is |
The dying old man opened his mouth as if ____ something.
| A．to say | B．saying | C．to have said | D．was saying |
— Are you a teacher?
— No, but I ____. I worked in a middle school for three years.
| A．am | B．will | C．do | D．was |
— How are you getting on with your work?
— Oh, I’m sorry. Things aren’t going so well as ____.
| A．plans | B．planning | C．planned | D．to plan |
— Why do you want the book so much?
— ____, sir.
| A．Studying | B．Studied | C．Studies | 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 |