Bylocaldoctorsandnurses,wehopemorepeople.
Thefirststepinthestudyofanylanguageisobservingand____preciselywhathappenswhennativespeakersspeakit.
Toobtainasatisfactoryresult，onemustapplytwo（）ofpaintonacleansurface.
The____populatedareawasabreedingplaceforinfectiousdiseases.