While watching TV, _.
| A．the telephone rang | B．the telephone was ringing |
| C．the telephone was heard ring | D．I heard the phone ringing |
The safety helmet saved the worker; otherwise, he_______ by a flying object.
| A．would be killed | B．would have been killed |
| C．was killed | D．had been killed |
This project _____ considered thoroughly, and I’m sure it _____ finished on time.
| A．must be; may be | B．should be; can be |
| C．may be; must be | D．can be; should be |
–Were they late for the play?
–Not really. As soon as they_______ themselves in their seats in the theatre, the curtain_______ .
| A．settled; went up | B．settled; had gone up |
| C．were settling; had gone up | D．were settled; went up |
—You were brave enough to argue with Mr. Smith. —Well, now I regret _______ that.
| A．to do | B．to be doing |
C．to have done | D．having done |
Too much pressure from study leads to sleeplessness, which _______ increases the risk of forgetfulness.
| A．in turn | B．in return |
C．by chance | D．by choice |