Many kinds of animals are believed to have _________from the earth
B
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Wedonothavea_______schoolinourinstitute.ThehighestdegreeweprovideforthestudentsisaB.A.andaB.S..
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
Afterworkingfortwentyhourswithoutanyrest,thedoctorswere_______.