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(19)21.—What'sthepopulation___theU.S.A?—TheU.S.Ahas___populationof297million．A．of…aB．of…/,C．in…a22．—Ireallyhatewinter,becauseI'mafraidofcoldness．—________A．SodidI．B．SodoI．C．SoIdo．23.___weareclever,__wemustworkhard．A．Eventhough…butB．Though…butC．Eventhough…/24.Themanthought,“Ishalltakeitbacktomorrow．”Themanthoughtthat___takeitback___.A．Ishall,tomorrowB．heshould,tomorrowC．heshould,thenextday25．_____childrenthereareinafamily,____theirlifewillbe．A．Theless…thebetterB．Thefewer…thebetterC．Fewer…richer26．Youcanputthepotatoesinsaltedwatertokeepthemfrom______black．A．turnB．turningC．turned27Heranawaywith______money．Thepolicearrested(逮捕）himseveraldayslater．A．agreatdealofB．manyC．anumberof28Wehavethreesonsbut____ofthemlivesnearby．It'shardtoseethem．A．neitherB．noneC．all29.Weshouldkeepourclassroom____．A．cleaningB．tocleanC．clean30．—Ourenvironmentisimproving．—Yes,moreandmoretrees____aroundourcity．A．areplantingB．areplantedC．planted31．Mostoftime,theyhadnotrouble___thelanguageofthecountrywhilehewastraveling．A．speakingB．speakC．tospeak32．—Hello,whereareyougoing?—Oh,I_____forHongKong．A．haveleftB．amleavingC．leaving33.Theyarrivedatthehoteljustnow.Theydidn'tknowwhichroom___．A．toliveB．forlivingC．tolivein34．Myparentsgavemeapresentonmybirthday．Icouldn’twait____itandhavealookatit．A．openB．toopenC．opening35．Nobodycananswersuchdifficultquestions___WangMingA．whileB．amongC．except36.TheteachertoldustospeakEnglish___．A．asmanyaspossibleB．asmuchaswecanC．asmuchaswepossible37．_____youngtreeshavebeenplantedalongthenorthChinatheseyears．A．MillionofB．MillionsofC．Severalmillions38．—Howlonghashe____thisbook?—Forseveraldays．A．borrowedB．borrowingC．kept39．Tomgrandma’sbeentotheGreatWalltwice,____?A．doessheB．doesn'tsheC．hasn'tshe40．____ofthesurface(表面)oftheearthiscoveredwithwater．A．FirstthirdB．TwothirdsC．Onethree
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