George once told me that he would visit our house，but，for various reasons，he________so far.
A．didn't B．hasn't
C．hadn't D．wouldn't
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；/
