It̉s ___ (possible) for anyone to finish the work within such a short time.
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Please don'̉t ____ (understand) what I have said.
He is a ________ (quality) teacher who is respected by his students.
For many Americans the automobile is a ________ (necessary)．
Excessive dosage( 剂量 )of this drug can result in ________(injure)to the liver.
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