________ from the moon, our earth with water ________ seventy percent of its surface looks like a blue sphere.
| A．Seen; covered | B．Seeing; covering | C．Seen; covering | D．Seeing; covered |
The newlylearnt words will be impressed on us only if they are ________used in everyday communication.
| A．gradually | B．accurately |
| C．familiarly | D．frequently |
A New York couple have been killed in a car crash on their way to hospital，but the unborn baby________the accident.
| A．experienced | B．survived |
| C．escaped | D．fled |
________that the government can clear up official corruption，we are________about the future of our country.
| A．Convinced；optimistic | B．Convincing；optimistic |
| C．Convinced；pessimistic | D．Convincing；pessimistic |
．General Secretary，Xi Jinping stressed that cross－strait cooperation would be strengthened________the two sides could agree to oppose Taiwan independence.
| A．as long as | B．even if |
| C．unless | D．until |
World leaders have to face the fact that ________ global warming has become perhaps ________ most complicated issue.
| A．/；the | B．/；/ |
| C．the；the | D．the；/ |