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1、Lesson 8 Lets save our planetWhen is World Earth Day?Its on April 22nd.What can we do to make our mother earth more beautiful?keep the rivers clean plant more trees and flowers protect wild animals ride the bikeWe can more. drive the carWe should stop driving the car all the time.cloth bagsWe can us
2、e . plastic bagsWe should stop using too many .keep the rivers cleanWe can .pour dirty things into themWe should stop pouring dirty things into them.What can we do to make our mother earth more beautiful?We can plant more trees and grass. We should stop cutting down too much trees.We mustnt waste an
3、y paper. We can write on both sides of it.We must save every drop of water. We should recycle.We should also protect animals.1.We should _ every _ of water and every piece of paper.2.Before you _ your _ away, you should pick out things you can _ .3. We live on the _ and this _ is our only homeland.
4、So we should do everything to _ it.4.We must not _ any _. When we finish our work on the puter, we should turn it off.savedropthrowlitterearthrecycleplanetprotectwasteenergySummarize:情态动词的用法：情态动词的用法：must, can, could, may, might, shall, should, will 不受人称变化的影响，在情态动词后面加动词原形。不受人称变化的影响，在情态动词后面加动词原形。What
5、can we do to protect the environment?We shouldnt throw litter on the ground.We should turn off the lights when we go out of the room.May I speak to ., please?We must practice a lot. 1.We should stop _ down too many trees. A. cut B. cutting C. cuts2. We should _ wild animals. A. protect B. protecting C. protects3.We _ waste any water, paper and energy. A. must B. neednt C. mustnt4.His English is _ than the others in our class. A. good B. gooder C. better5.He isnt at school today. He _ be ill. A. should B. must C. will6.We shouldnt pour dirty things _ the river. A. in B. to C. into
