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