________,Johnhasbeentoseveralforeigncountries.
A、EvenheisyoungWhenworkersareorganizedintradeunions,employersfindithardtolaythem________.
________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.
Iwon't________thosechildrenmakinganoiseinmyhouse!
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
