Severalloudspeakersare_______fromtheceilingandwecanhearthespeakerveryclearly.
A、connectedWhenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
Whentravelingaloneinthemountains,you’dbettertakea_______withyouincaseyougetlost.
Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.
ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
IntheUnitedStates,theforeignpolicyisdecidedbythe________government,notbyeachstate.
