Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
A、surfaceManykindsofanimalsarebelievedtohave_________fromtheearth
Whentravelingaloneinthemountains,you’dbettertakea_______withyouincaseyougetlost.
This boy was _______ for what he had done in the class.
As a teacher, you should not _______ the students from asking questions in class.
Several loudspeakers are _______ from the ceiling and we can hear the speaker very clearly.
