________(fail)severaltimes,theyneedsomeencouragement.
Thosewho’dliketovisittheexhibition________(sign)yournameshere.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Wooddoesnotconductelectricity;________.
Hotmetal________asitgrowscooler.
Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.