Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Thefloordoesnotlooksobadwhen________(sweep)clean.
Themorewelookedatthepicture,________.
Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.
Night________(fall),wehurriedhome.
________(fail)severaltimes,theyneedsomeencouragement.
