We can never expect _______ bluer sky unless we create _______ less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
The _____ on her face suggests that she didn’t pass the driving test.
| A．appearance | B．impression |
| C．attitude | D．expression |
It took me quite a long time to develop a voice, and _______ I have it, I am not going to be silent.
| A．now that | B．unless |
| C．so that | D．although |
With Chang'e-3 successfully landing, China bees the third country in the world that _______ on the moon.
| A．lands | B．has landed |
| C．landed | D．was landing |
People Who Moved China, hosted by CCTV, honors the people _______ the valuable contributions should be remembered by every Chinese.
| A．whose | B．of whom | C．that | D．of which |
—I’m sorry I stepped on your foot; it was an accident.
—It wasn’t! You did it ______________ .
| A．as usual | B．on purpose |
| C．at an end | D．right away |