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Was it not until you began to work —— how much time you had wasted?

A.did you realize???? B.that you realized??? C.did you not realize??? D.that you didn’t realize

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

—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

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

The most impressive sight in China，one of the wonders of the world，_____? the Great Wall.

A.is??? B.are??? C.was??? D.were

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

_____, 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

Where???? go to spend our summer vacation this year?

A.do you think can we? B.do you think we can

C.you think can we???? D.you think we can

Is that a book on farming?_______,I want to borrow it.

A.So it is????????? B.If so???????? C.So is it????????? D.So if

Generally speaking_______acording to the

instructions，the drug has no side effect.

A.when taking??? B.when taken?? C.when to take????? D.when to be taken