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No bread eaten by man is so sweet as ________ earned by his own labor.
A．oneB．thoseC．itD．that

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Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand.
A．whenB．whichC．whyD．where

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It was not until all the milu deer ________ that we realized we should build a natural park to protect them.
A．died offB．died away C．died out D．died down

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.The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.
A．ifB．beforeC．thoughD．unless

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Since the Obama administration took office, the China—US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the Nuclear Security  Summit in Washington, April,12,2010.
A．witnessedB．were witnessedC．had witnessedD．have witnessed

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----- Can you use chopsticks, John?
----- ________ . I once stayed in China for two years.
A．No problemB．It all depends
C．I’m sorry, but yesD．You can forget it

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---Excuse me, sir, is this seat taken?
---_______.
A．Sure, you may take itB．Certainly. Help yourself
C．No. I don’t think soD．No. I don’t hope so

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He had _____ me to come to the party, but he didn’t show up.
A．allowedB．promisedC．wantedD．advised

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My neighbor’s daughter changed so much that I didn’t ____ her at first sight.
A．realizeB．recognizeC．researchD．reserve

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I have to go to work by taxi because my car ____ at the garage.
A．will be repairedB．is repairedC．is being repairedD．has been repaired

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