Many experts stick to the view _____ teacher development is _____ the key to quality education lies.
| A．which; where | B．which; in which |
| C．that; where | D．that; in which |
The video，Gangnam Style，is becoming the first video________more than one billion views.
| A．got | B．getting |
| C．to get | D．gets |
The problem is so complex that I'm afraid it will take me several hours to________．
| A．put out | B．set out |
| C．break out | D．figure out |
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 |