canhavetoturnontakeactionturnoffinsteadoflookafterbeginwithPeoplemightthinkthatbigthingsmustbedonetosavetheearth．Manyforgetthatsavingtheearth（73）___smallthings．Forexample，you（74）__

can   have to   turn on   take action  turn off   instead of   look after   begin withPeople might think that big things must be done to save the earth．Many forget that saving the earth（73）___ small things．For example，you（74）___ save electricity by（75）___ the lights when you leave a room．You could also use reusable bags（76）___ plastic bags．I think it's a great idea that you now（77）___ pay for plastic bags in some stores．And instead of driving to school or work，you could ride your bike or walk．If it's far，you can take the bus．All these small things can add up and become big things that would improve the environment．Let's（78）___ now!