Heworksinouruniversityasavisiting_______,notasaformalfacultymember.
ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
The college students in China are _______ from smoking on campus because this will do them no good.
Thismorningintheclass,ourteacherlosthis______atlastbecausehecouldnotstandanymore.