Theboycomplained_______apaininhisstomach.
OneoftheresponsibilitiesoftheCoastGuardistomakesurethatallships______followtrafficrulesinbusyharbors.
Withsuchapoorscoreintheentranceexam，it’s________impossibleforhimtobeadmittedtothisuniversity.
Anxietycan________withchildren’sperformanceatschool.
Thetwogirlscompetedwitheachother______thehighestmark.
