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一、选择题 1.IthinkthecoffeebeansarefromBrazil,________I’mnotcompletelysure. A.because B.since C.though D.whether 2.Don'tbeafraidofaskingforhelp________itisneeded. A.unless B.until C.although D.when 3.—Itisapitythatthediseaseisstillterribleatpresent. —Yes.Itwillbeworse________wetakefurtheractiontodosomethingforit. A.unless B.since C.if D.when 4.Alltheteenagersshouldkeeptakingexerciseeveryday________theyarebusystudyingsomanysubjects. A.until B.because C.unless D.though 5.Mr.Pagestillplanstotakeupanewhobby________heisalmost70yearsold. A.though B.because C.if D.while 6.Manypeopledonotrealizetheimportanceofhealth_________theyhavefallenill. A.until B.while C.when D.after 7.—ThenovelwrittenbyStephenseemsabitboringtome. —___________youputyourheartintoit,youwon'tenjoyit. A.When B.If C.After D.Unless 8.Allstudentsshouldkeeptakingexerciseeveryday_______theyarebusystudyingsomanysubjects. A.until B.because C.though D.unless 9.—Doyouoftentakeexerciseinthemorningeveryday? —Yes.Igojoggingeverymorning_______thereisheavyairpollution. A.until B.unless C.if D.as 10.Millie’sresearchpaperisn’tuptostandard_________shehasworkedatitfortwoweeks. A.since B.unless C.if D.although 11.—WhatdoyouthinkofMr.Green,Tim? —Heissoboring.Hedoesn'thaveanyhobbies________youcallwatchingTVahobby. A.if B.unless C.since D.though 12.________thatmoment,Ineverrealizedhowmuchmyfatherlovedme. A.At B.Unless C.Until D.Since 13.MyparentsgaveredpacketstomycousineverySpringFestival___________shegotajob,becauseshesaidshewasabletomakemoney. A.after B.when C.until D.since 14.MygrandmaenjoyssharingvideosonDouyinliketheyoung________sheisoverseventy. A.since B.if C.though D.unless 15.—DidyouwatchtheNewsNetworkShowyesterday? —Yes,ofcourse.Inevermissit________Ihavetoomuchhomework. A.unless B.until C.if D.since 16.—_______Dr.ZhongNanshanknewthatCOVID-19wasadeadlynewvirus,hestillwenttoWuhaninCentralChinatohelpthelocalpeople. —Heisreallyabraveandkinddoctor. A.If B.Assoonas C.Because D.Although 17.—_________Ihavetriedmanytimes,Ican't