It's more ________ to buy a season ticket if you travel every day.
A
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Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.
Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.