Edison tested more than one thousand materials to see if they could _____ electric ; current and glow.
A、bringC
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Inmostcountries,themetricsystemhasbeen_____forallmeasurement.
Dr. Byer is ____ with the renovations made to his clinic by the remodeling company
Theequipment_____outoforder,theexperimenthastobeputoff.
Anyvisitorstotheproductionfacilitiesmust____asecuritypassfromtheinformationdeskatthefrontentrance.
To begin some activity is to _____ doing it.
