. --- The terrible accident is under investigation.
--- Actually, quicker action______ those workers trapped in the mine.
| A．might have saved | B．must have saved |
| C．should have saved | D．could have saved |
A ______ person always tries to finish the job, no matter how hard it is.
| A．stubborn | B．determined | C．reliable | D．remarkable |
Leave your key with your neighbor _you lock yourself out one day.
| A．as long as | B．in case | C．even though | D．as if |
You should report any incident, ______ minor it is.
| A．whatever | B．whenever | C．however | D．wherever |
Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself.
| A．whenever | B．by the time | C．the moment | D．ever since |
I ______ to go on a diet, but the dishes at the party were simply impossible to resist.
| A．had intended | B．am intending | C．intend | D．could intend |