Young________hewas,hemanagedtomakealivingonhisown.
Evenwiththenewdevelopmentinresearch,onlyatiny________ofalltestsaredonewithoutusinganimals.
is,are,was,were,itself,himself,themselvesThetradeunion________believedtoregard________asanorganizationwherethemolestedcouldseekadviceandhelp.
Welodge(声明)aclaim_______you_____theshort--weight.()
Chinaisamountainouscountry.Hills,mountains,andplateauscover_______ofthetotalarea.
