Unit7ProtecttheEarth习题1一、句型转换。1.Weshouldplantmoretreestokeeptheairclean.（改为一般疑问句）weplantmoretreestokeeptheairclean?2.Youshouldturnoffthelightstosaveenergy.（改为一般疑问句）turnoffthelightstosaveenergy?3.Youshouldcutmoretrees.（改为否定句）Youmoretrees.4.Weshouldusemanyplasticbagsandplasticbottles.（改为否定句）Weusemanyplasticbagsandplasticbottles.5.Weshouldsaveandreusewater.（改为疑问句）saveandreusewater.二、根据课文内容填空。1.Wedrinkwaterandwatercleanthingseveryday.2.Wesaveandrescueit.3.ThereisnotmuchandonEarth.4.Woodfromtrees.5.Weplasticmakebottlesandbags.
