_____, Carolina couldn't get the door open.
A. Try as she might B. As she might try C. She might as try D. Might she as try
Either you or one of your students___to attend the meeting__ tomorrow.
A.are; to be held B.is；being held C.is; to be held D.are；having held
The most impressive sight in China，one of the wonders of the world，_____ the Great Wall.
A.is B.are C.was D.were
The factory used 65 percent of the raw materials,the rest of which saved for other purposes.
A.is B.are C.was D.were
—Why does the lake smell terrible?
—Because large quantities of water_______________.
A.have polluted B.is being polluted
C.has been polluted D.have been polluted
One-third of the country____covered with trees and the majority of the citizens_______black people.
A is；are B is；is C.are；are D.are；is
