1、Lesson 17Unit 3 We should obey the rules.提示：点击进入习题四一二三五一、将方框内的选项归类到相应的横线上。1.We must:_2.We mustnt：_B C E F A D A.keep off the grass B.litterC.pick the flowersD.take good care of the young childrenE.spit on the ground F.play on the street点拨：look after照顾；look at 看一看；look out 小心。二、单项选择。()1._！Dont play o
2、n the street.It is too dangerous.A.Look after B.Look atC.Look outC()2.The red light is on,so you must wait_ the green light.A.for B.of C.to()3.Dont spit _ the ground.A.in B.at C.onA 点拨：spit on the ground 在地上吐痰。点拨：wait for 等待。C()4.What should we do in public places?A.We shouldnt keep quiet.B.We shoul
3、d keep quiet.C.We can spit everywhere.B()5.Sanitation workers(环卫工人)have cleaned the street.You mustnt _.A.litter B.keep off the grassC.cross the streetA三、按要求完成句子。1.You must be careful when you cross the street.(改为否定句)You _ _ _ careful when you cross the street.neednt to be点拨：must为情态动词，must的否定形式为need
4、nt to。2.We should look after our parents well.(改为同义句)We should _ _ _ _ our parents.take good care of点拨：look afterwell 照顾好；take good care of照顾好。3.You mustnt litter on the ground.(改为祈使句)_ litter on the ground.4.A good child shouldnt pick the flower.(改为复数句)Good _ shouldnt pick the _.Dont children flowe
5、rs四、选择正确的应答语。()1.What must we do?()2.Look out!Dont cross the street now.()3.Please spit on the paper.()4.Are they your children?()5.You mustnt pick flowers.BDCEAA.Im sorry.B.We must help each other.C.OK.I will.D.Oh,thank you.E.Yes,they are.五、核心素养练 同学们,每年都有很多起因不遵守交通规则而造成的事故。请你为全班创编一首英文交通安全歌谣,提醒大家注意交通安全。读一读,补全句子。When you_at the crossing,You should cross the street at the _.You shouldnt cross the street at the _.Green green lights,go go go.Yellow yellow lights,wait wait wait.Red red lights,stop stop stop.cross the streetgreen lightred light
