When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.
A、surfaceB
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When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.
Studentswith_______problemsmayapplyforstudentloans.
IntheUnitedStates,theforeignpolicyisdecidedbythe________government,notbyeachstate.
This morning in the class, our teacher lost his ______at last because he could not stand any more.
This river is so big that it is impossible to build a _______under it without modern technology.
