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I had been puzzled over the problem for over an hour without any result,_____all at once the solution flashed my mind.
A while B when C then D as
Be more practical.Haven't you heard the saying"One bird_____is worth two in bush"?
A in hand B at hand C on the hand D on the other hand
Human beings' wrong doings have caused_____against wild animals' existence,which calls on the public's attention.
A accidents B threat C a danger D kill
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