18．阅读下面短文，并借助上下文和插图补充所缺信息，每个空只需填写一个形式正确、意义相符的单词．请将答案写在答题卡相应题目的答题位置上．
My name is Peter．I live （71）close to a forest．I used to love going there to play with my （72）dog，but one day there was so much （73）trash/rubbish/litter there that I became very unhappy．I decided I had to （74）clean the forest．I made my first trip that afternoon．I took a big black rubbish bag with me．Ten minutes later，my bag was （75）filled with rubbish．Since that trip three years ago，I've been to the forest four times a year to（76）pick up litter．It is certainly everyone's duty to protect the （77）environment．
As known to all，nowadays，the low-carbon（低碳） lifestyle is becoming more and more popular．There are many ways to lead a low carbon life．As a student，we can spend more time （78）with family and friends，plant more trees，use cloth bags （79）instead of plastic bags and so on．Don't you think it's easy to do those things？If everyone （80）cares more about"Mother Earth"and keeps it a habit in our daily life，the earth will become a safer planet for us to live on．
