题目内容：
IntheUnitedStates,acountryofimmigrants,prejudiceanddiscrimina-tioncontinuetobeseriousproblems.Therewasoftentensionbetweeneachestablishedgroupofimmigrantsandeach（26）group.Aseachgroupbecamemorefinanciallysuccessfulandmorepowerful,they（27）fullparticipationinthesociety.PrejudiceanddiscriminationarepartofAmericanhistory;however,thisprejudicialtreatmentofdifferentgroupsisnowheremoreunjustthanwithblackAmericans.
Blackshad（28）disadvantages.Forthemostpart,they（29）thelandofopportunityasslavesandtheywerenotfreetokeeptheirheritageandculturaltraditions.UnlikemostEuropeanim-migrants,blacksdidnothavetheprotectionofasupportgroup.Theycouldnotmixeasilywiththe（30）societyeitherbecauseoftheirskincolor.ItwasdifficultforthemtoadapttotheAmericanculture.
Evenaftertheybecamefreepeople,theystill（31）discriminationinemployment,housingandeducation.
Untilthetwentiethcentury,the（32）oftheblackpopulationlivedinthesouthernpartoftheUnitedStates.TherewasapopulationshifttothelargecitiesintheNorth.Prejudiceagainstblacksisoften（33）theSouth.
Inthe1950sand1960s,blacksfoughttogainfairtreatment,andtheynowhavelegalprotectioninhousing,educationandemployment.Becausetheirneighborhoodsaresegregated(隔离),manyblacksfeelthateducationalopportunitiesarenot（34）fortheirchildren.Busingchildrenfromoneneighborhoodtoanotherisonesolutiontoinequalityineducation.Naturally,allparentswantthebestpossibleeducationfortheirchildren.
Thesituationofblacksisbettertodaythanitwasinthe1950s,but（35）tensionpersists.Timewillbetherealsolutiontotheproblemofrace.
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