China first agreed the six-party talks about North Korea nuclear weapons program.
A．to attend B．to join C．to participate in D．to take a part
It is wise of you to well trained workers for untrained ones in your workshop.
A．substitute B．change C．exchange D．employ
Many students listened to the lecture, but I wondered how much they .
A．took out B．took up C．took off D．took in
The customs office is your luggage is inspected when you enter or leave a country.
A．where B．when C．why D．who
We are proud of our hometown, which is in coal and natural crystal（水晶石）.
A．abundant B．universal C．remote D．autonomous
However much you have done, you ought to the help you’ve received from others.
A．donate B．acknowledge C．conduct D．guarantee
