We must ______ that the experiment is controlled as rigidly as possible.
A
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________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.
Inthefuture,more______shouldbeplacedontheeducationoftheyoung.
TheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).