Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
ItwasthreeBritishsportsmenwho________banneddrugs.
_______ the movie I would have finished my paper last Sunday.
________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.