It is useful to science _______ the earth as an object in space.
C
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ItwasthreeBritishsportsmenwho________banneddrugs.
TheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).
We must ______ that the experiment is controlled as rigidly as possible.
The address book ________ the email addresses of your friends or groups of colleagues.