Edisontestedmorethanonethousandmaterialstoseeiftheycould_____electric;currentandglow.
Iwasoverjoyedatthenewsofmycounty_____somuchprogress.
Undernocircumstances_____anythingthatwillbenefitourselvesbutatthesametimeharmtheinterestsof。
Makesurethattransportationtoandfromtheriverisarrangedtoyour______.
Hehasmadeanotherwonderfuldiscovery,_____ofgreatimportancetoscience.