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We need to get to the root of the problem______ we can solve it.

A . while B . after C . before D . as

____ the damage is done, it will take many years for the farmland to recover.

A . Until B . Unless C . Once D . Although

There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.

A . since B . if C . as D . while

Backward somewhat technologically ________ we are for the moment, we have confidence in our ability to catch up in time.

A . although B . if C . as D . once

I was ________ excited at that moment ________ I didn't know what to say.

A . such. . . that B . too. . . that C . rather. . . that D . so. . . that

Every year, ______ makes the most beautiful kite will win a prize in the Kite Festival.

A . whatever B . whoever C . whomever D . whichever

Although you are green, don't worry. you get older, you'll get more experienced.

—What a mess! You are always so lazy!

—I'm not to blame, mum. I am ________ you have made me.

A . how B . what C . that D . who

From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.

A . why B . how C . because D . whether

Everyone can make great progress______he works hard.

A . unless B . as long as C . when D . while

The woman was about to open the door ____________ she heard a strange sound from inside.

A . as B . while C . when D . then

The engineers are so busy that they have zero time for outdoor sports activities, ________ they have the interest.

A . wherever B . whenever C . even if D . as if

(即使那次事故让他严重残疾),he didn't give up the experiment.

________some people criticize graffiti for being ugly and destructive, those graffiti lovers still see it as real art.

A . As B . While C . Once D . Until

You will be praised or blamed your work is good or bad.

A . according B . as C . according as D . because

— Why didn't you help the little boy?

—Oh, he had struggled to his feet ______ I could run over and offered any help.

A . before B . after C . when D . since

I was on the point of speaking my wife stood up and stopped me.

A . since B . as C . when D . while

It is said that body language accounts for 55 percent of a first impression what you say just 7 per cent.

If you don't understand something, you may research, study, and talk to the other people you figure it out.

________a lot of hard work and a touch of luck play a part, perseverance is the key to success.

A . When B . While C . Unless D . Where

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