Weare_______attherapidprogressMarkhasmadeinthissemester.

Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.

The_______workcontinuedformorethanaweekbuttherewasstillnosignofthemissingboy.

Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.

ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.