7．It's very important that we all recycle．In nature，everything is used again．For example，when an animal dies，it becomes （86）another animal's food．Nothing is （87）wasted．But humans have created things like plastic bags which can't be broken down by nature．Our rubbish kills animals and （88）pollutes water and soil．If we （89）continue making too much rubbish，the problem will only get （90）worse．If nature can't reuse the rubbish，we must recycle （91）it．We should clean up the rubbish we've made because nature can't． Recycling is （92）also the right thing to do for another reason．The Earth is （93）rich in natural materials like water and trees，（94）but these materials are not endless．We use up our natural materials much faster than the Earth is able to reproduce them．For example，each year we cut down more than 6，000square miles of forest．But it （95）takes about 25years for a new tree to grow． Recycling can help us save the Earth，so let's take action right now．
