It took a great deal of courage to admit that all his efforts had been ____.
| A．in vain | B．in turn | C．in return | D．in danger |
______ strong and powerful China will certainly benefit ______ whole world.
| A．A; a | B．The; a |
| C．The; the | D．A; the |
______ to smoking for a considerably long time, he has much difficulty quitting it.
| A．Having been addicted | B．Being addicted |
| C．To have been addicted | D．Having addicted |
Was it through Mary, ______ was working at a high school, ______ you got to know Tom?
| A．who; who | B．that; which |
| C．who; that | D．who; which |
The father, ready to retire at an early age, hoped that his eldest son would ______ the family business.
| A．take over | B．look into |
| C．take up | D．look through |
My sister-in-law is the ______ of the information, so it cant be false.
| A．resource | B．source |
| C．birthplace | D．data |