Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
A、surfaceThe_______isnearlydead,soIcannotstartthecaragain.
Asateacher,youshouldnot_______thestudentsfromaskingquestionsinclass.
Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.
Manykindsofanimalsarebelievedtohave_________fromtheearth
Hetriedto_______relationswithhisformerwifebuthefailed.
