A：Oh，Joe．Whatcanwedotohelpprotecttheenvironment？B：Youshouldbecarefulnottousetoomuch（71）___whenyouwashclothesordishes，eventakeashower．A：Well，Idon'tthinkIusethatmuchanyway．B：Yes，butIamsure

　　A：Oh，Joe．What can we do to help protect the environment？

　　B：You should be careful not to use too much （71）___ when you wash clothes or dishes，even take a shower．

　　A：Well，I don't think I use that much anyway．

　　B：Yes，but I am sure if you try harder，you can use （72）___．

　　A：Thank you for your encouragement．I'll try my best．

　　B：Then，we shouldn't （73）___ paper because trees are being cut down to make paper．You can help by recycling paper．

　　A：How can we recycle paper？

　　B：You can use （74）___ sides of every piece of paper．

　　A：OK，that's easy．

　　B：Another way is turning off your computer when it is not in use．That will （75）___ electricity．

　　A：I never thought of that．And I usually leave rooms with the lights on，too．

　　B：When drinking or eating something outside，please throw the garbage into the trash because it makes our planet （76）___．

　　A：I will．I don't like seeing trash all over the ground．