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1.Scientistshaverecentlyturnedtheirattentiontonaturalsourcesofenergy:thesun,thesea,thewind,andhotsprings.Youranswer(s)Correctanswer(s)sourcessources2.Ifpresentdirectionscontinue,theworldintheyearsaheadwillbemorecrowded,morepolluted,andlessstableecologically(生态上)thantheworldweliveinnow.Youranswer(s)Correctanswer(s)stablestable3.Coalwasformedoutofdeadforestsbyalongslowprocessofchemicalchange.Youranswer(s)Correctanswer(s)processprocess4.Thechildrenwillnowplaysomepiecesofmusicthattheycomposedthemselves.Youranswer(s)Correctanswer(s)composedcomposed5.Theboyisquiteinterestedinobservingthebehaviorofbirds.Youranswer(s)Correctanswer(s)observingobserving6.Ontheirowntheyworkwell,butincombinationthey'readisaster.Youranswer(s)Correctanswer(s)combinationcombination7.Thepopulationexplosioninthepasttwodecadesaccountsforthelackoffoodandhealthcareinmanypartsoftheworld.Youranswer(s)Correctanswer(s)explosionexplosion8.TheUnitedNationscameintoexistencein1945.Youranswer(s)Correctanswer(s)existenceexistence9.IhadforgottenallaboutitbecauseIhadbeensooccupiedwithotherthings.Youranswer(s)Correctanswer(s)occupiedoccupied10.Thegovernmentisconsideringajobcreationprogramtohelpyoungpeoplegetemployed.Youranswer(s)Correctanswer(s)creationcreation11.Thecrowdoccupyoutfromthegateandseparatedonthevastsquareinfrontofthecinema.Youranswer(s)Correctanswer(s)occupysurged12.MarkTwain'snovelTheAdventureofTomSawyerobserve19th-centurylifeintheUnitedStates.Youranswer(s)Correctanswer(s)observeexemplifies13.Icansaywithcomposethatthecompanyhasbeenboughtup;someoneontheboardinformedmeofthis.Youranswer(s)Correctanswer(s)composecertainty14.Whenhegotupstairs,Johnwasverytiredandstablehimselfonacouch.Youranswer(s)Correctanswer(s)stableflung15.It'snotexplosiontoexpectasmallchildtounderstandsuchadifficultquestion.Youranswer(s)Correctanswer(s)explosionreasonablePleasenotethatthesystemwillonlyrecordyourfirstsubmission.Doyouwanttosubmitnow?1.Itisimportanttounderstandthepowerfuleconomicandsocialforcesatworkbehindouractions.Youranswer(s)Correctanswer(s)atat2.Thislawhasbeeninexistencesincetheendofthe1950s.Youranswer(s)Correctanswer(s)inin3.Howlongasuitlikethisshouldlastdependsonhowoftenyouwearit.Youranswer(s)Correctanswer(s)onon4.Badworkmanshipandinferiormaterialsareresponsibleforthecollapseofthebridgeontheriver.Youranswer(s)Correctanswer(s)forfor5.We'llhavetosleeponyourinvitationuntilweknowwhetherwewillbefreeonMondaynight.Youranswer(s)Correctanswer(s)onon6.Thebookpresentsaveryinterestingcontrastbetweenlifenowandlifeahundredyearsago.Youranswer(s)Correctanswer(s)betweenbetween7.Scientistsarestillsearchingforaneffectiveandinexpensivecuretothecommoncold.Youranswer(s)Correctanswer(s)forfor8.Thegeneralmanagerhasnotimetoseeyouatthemoment;heisoccupiedwithsolvingsomeurgentproblems.Youranswer(s)Correctanswer(s)withwith9.Afterthreeweeksofobservation,wearrivedattheconclusionthatShellyiscapableofconductingtheexperiment.Youranswer(s)Correctanswer(s)atat10.Areyouropinionsrepresentativeofthoseoftheotherstudentsinyourclass?Youranswer(s)Correctanswer(s)ofof11.NineteenthcenturylifeintheUnitedStatesisexemplifiedinthenovelTheAdventureofTomSawyer.Youranswer(s)Correctanswer(s)inby/in12.Nonethelesstherearesignsthatbothsidesmaybeseekingforacompromise.Youranswer(s)Correctanswer(s)forfor13.MostAmericansrelyontelevisionastheirchiefsourcefrominformation.Youranswer(s)Correctanswer(s)fromof14.Acombinationofhighinterestratesandfallingmarketdemandhasforcedthecompanytoclose.Youranswer(s)Correctanswer(s)ofofPleasenotethatthesystemwillonlyrecordyourfirstsubmission.Doyouwanttosubmitnow?YouranswersCorrectanswers1.exemplifiesexemplifies2.occursoccurs3.certaintycertainty4.revealsreveals5.combiningcombining6.laboredlabored7.mysterymystery8.observeobserve9.employedemployed10.particularlyparticularlylaboredmysteryobserveexemplifiesappliedcomposesemployedoccursparticularlyrevealsunusuallyemergingcertaintycombiningperspectiveYouranswersCorrectanswers1.awakeawake2.hardhard3.whatwhat4.justicejustice5.moremore6.unconsciousunconscious7.explainingexplaining8.WhyisthereWhyisthere9.asthoughasthough10.doesnotexistdoesnotexist11.mysterymystery12.lessless13.entertainedentertained14.myselfmyself15.makemake16.ontoonto17.notnot18.capturecapture19.seekingseeking20.secretsecretPleasenotethatthesystemwillonlyrecordyourfirstsubmission.Doyouwanttosubmitnow?1.这个城市有20所大学，其中有的是世界知名大学。(usinganattributiveclause)Therearetwentyuniversitiesinthiscity,someofwhichareworlSuggestedanswer:Therearetwentyuniversitiesinthiscity,someofwhichareworld-famous.2.他越想这件事，就越生气。(Usethemore...,themore...structure)Themorehethinksaboutit,theangrierhebecomes.Suggestedanswer:Themorehethinksaboutit,theangrierhebecomes.3.她对那些无辜的受害者充满了同情。(fillwith)Shewasfilledwithpityfortheinnocentvictims.Suggestedanswer:Shewasfilledwithpityfortheinnocentvictims.4.他全身心忙于公务，根本没有时间考虑休假。(beoccupiedwith)Hewasoccupiedwithhisbusinessmattersanddidn'thavetimetoSuggestedanswer:Hewasoccupiedwithhisbusinessmattersanddidn'thavetimetothinkaboutaholiday.5.这个国家的经济在一定程度上依赖于原材料的进口。(dependon)Thecountr