Unit7一、用括号里的词的适当形式填空。1.IfMarcia________(live)alone,she_____________(keep)apetparrot.2.Flowers________(die)ifyou__________(notwater)themforalongtime.3.Ifpandas___________(have)nofood,they__________(die).4.She___________(notgo)tothepartyunlessyou_________(invite)her.5.Ifspring_________(come),thetrees__________(turn)green.6.Ifyou_________(put)sugarintowater,it________(disappear).7.Ifyoudon’twatertheplantinsuchhotweatherforalongtime,it________(die).8.TheSun_______(shine)brightlyiftherearenocloudsinthesky.9.Ifthereisalightening,athunder(雷声)________(come)later.10.Ifyouworkharder,you_________(pass)theexam.11.Thedog______(think)youarefriendlyifhewaveshistailtoyou.12.IfIcanseethefile(文件)，I__________(know)howimportantitis.二、用if或unless填空。1.Mybabysisterdoesn’tcry______shefeelshungry.2.Iruneverymorning______itdoesn’train.3.Iruneverymorning________thebadweatherstopsme.4._______youdon’tdoanyexercise,youwillgetfatter.5.Youmustn’tcrosstheroad______thetrafficlightturnsred.三、选择题。1.Ifyou_______totheparty,you____agreattime.A.willgo,willhaveB.go,haveC.go,willD.willgo,have2.I’llgivethebooktohimifhe_______herenextSunday.A.willcomeB.comesC.iscomingD.came3.Ifyou____thevase,it_____intopieces.A.drop,willfallB.willdrop,fallsC.willdrop,willfallD.drop,falls4.Youwon’tgethighmarks____youstudyhard.A.ifB.unlessC.afterD.though5.Ifyou_____metal,it____.A.heat,meltB.heat,willmeltC.heat,meltsD.heats,melts6.Ifhe____,he____thereontime.A.runs,willgetB.runs,getsC.willrun,getsD.willrun,willget7.Ifyou____awineglass,it____.A.willdrop,willbreakB.drop,willbreakC.willdrop,breaksD.drop,break四、完成句子。1.如果鱼离开了水就会死。Afish______ifit_______outofwater.2.如果你把水烧开（boil）,有些水会变成水蒸气。Ifyou________water,someofit_______intosteam.3.如果你吃得太多，你会觉得很饱。You______veryfullifyou______toomuch.2
