ThecollegestudentsinChinaare_______fromsmokingoncampusbecausethiswilldothemnogood.
ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
Thismorningintheclass,ourteacherlosthis______atlastbecausehecouldnotstandanymore.