The_______workcontinuedformorethanaweekbuttherewasstillnosignofthemissingboy.
IntheUnitedStates,theforeignpolicyisdecidedbythe________government,notbyeachstate.
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.