________, John has been to several foreign countries.
A、EvenheisyoungB
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Be careful, _______ you'll fall down.
Thestudentfoundthenovel_______.Itprovidedhimwithsomuchinformationaboutthesubject.
Only a(n) ________ few were invited to the dancing party.
Hethoroughlyunderstoodthesociety__________.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
