______ do we owe the discovery of the wild land?
| A．What | B．Who |
| C．To whom | D．For what |
She has already tried her best. Please don’t be _____ about her job.
| A．special | B．responsible | C．uncertain | D．particular |
— You look upset. What’s the matter？
— I had my proposal _______ again.
| A．turned over | B．turned on | C．turned off | D．turned down |
In that school, English is compulsory for all students, but French and Russian are _______.
| A．special | B．regional | C．optional | D．original |
You’ll find taxis waiting at the bus station ______ you can hire to reach your host family.
| A．which | B．where | C．when | D．as |
The police officers in our city work hard ______ the rest of us can live a safe life.
| A．in case | B．as if | C．in order that | D．only if |