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---Our teacher wouldn’t give us the answers to the questions directly.
---Why not work them out all by _____?
A.themselvesB.himselfC.ourselvesD.myself

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Although I failed four times, my father encouraged me to have a ____try.
A.secondB.thirdC.fourthD.fifth

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---I heard you liked small animals very much.
---Yes. I _____a dog and a cat as pets.
A.keptB.fedC.foundD.sent

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---Excuse me, please look at the sign “No Smoking”.
---Sorry, I _____.
A.don’t notice itB.a(chǎn)m not noticedC.didn’t notice itD.wasn’t noticed

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Look at these pictures carefully, and decide which sentence is right? ______.
       
A.Milk is cheaper than coke.B.Milk is the most expensive.
C.Orange juice has the same price as water.D.Coke is more expensive than orange juice.

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---Whose English-Chinese dictionary is this?
---It’s _______. My parents bought it for my sister and me.
A.hersB.oursC.mineD.theirs

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Guo Yue did quite ______at the World Table Tennis Championship (錦標(biāo)賽), but Zhang Yining
did even ______.
A.better; wellB.well; wellC.well; betterD.better; better

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---Could you tell me how long ______the book?
---Three days.
A.I can keepB.can I borrowC.I can borrowD.can I keep

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設(shè)為非零向量,且不平行,求證不平行

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若存在正整數(shù),使得能被整除,則=        

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