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21.Englishhasbecomeacommunication_______forpeoplefromdifferentcountries.
22.Duringtheeightyearswar,manypeople_______theirbloodfortheircountry.
23.Youhavegreatly_______us.Whatyouhavedoneisnotwhatyoutoldusaboutseveralweeksago.
24.Beforeyoubeginwritingyourpaper,pleasewrite------__________first.Thenwecanhaveabetterideaaboutwhatyouaregoingtotalkabout.
25.IfyouaskwhyIplantostudyintheUnitedStates,theonlyansweristhatitisa_______forme.
26.A_______politicalandeconomicsituationisveryimportantforthedevelopmentofanycountry.
27.ThefinancialsupportisdecidednotonlyaccordingtoyourGREscore,butalsoaccordingtoyour_______incollege.
28.TheWorldTradeCenterisoftencalleda_______Building,becauseitismadeupoftwoidenticalbuildings.
29.Itisimpossibleforusto_______suchadifficulttaskwithinthelimitedtime.
30.Pleasedonot_______whensomebodyelseistalking.