The moment John will never forget is Mr. Smith gave him a lot of valuable advice on how to improve his writing.
A．that; that B．that; when C．when; that D．when; when
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
