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
The girls in the photograph are twins, is my classmate in high school.
A．the taller of them. B．the taller of whom.
C．the tallest of that D．the tallest of who
