We must ______ that the experiment is controlled as rigidly as possible.
A、assureA
暂无解析
WhenIcamethroughthecustomsattheairport,Ihadtopay________onaclockIhadbought.
Seniormembersofthestaffcompetedeagerly________thepositionofsalesmanagerinthecompany.
Tostudyaforeignlanguage,__________.
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
It________asashocktorealizethatIwasnotaloneintheroom.
