When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.
A、surfaceB
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Sheisalready16yearsold.Butshe_______asifshewerestillalittlegirl.
Asateacher,youshouldnot_______thestudentsfromaskingquestionsinclass.
Wedonothavea_______schoolinourinstitute.ThehighestdegreeweprovideforthestudentsisaB.A.andaB.S..
John_______tobeapoliteman.Butinfactheisveryrude.
Whathesaidinthemeeting_______everybodypresent.
