It's very important that we all recycle （再利用）．In nature，everything （26） ____ again．For example，when an animal dies，it becomes （27） ____ animal's food．Nothing is wasted．But humans have created things like plastic bags（28） ____ can't be broken down by nature．Our rubbish kills animals and（29） ____ water and soil．（30） ____ we continue making too much rubbish，the problem will only get worse．If nature can't reuse the rubbish，we must recycle（31） ____ ．We should clean up the rubbish we've made because nature can't．Recycling is also the right thing to do for another reason．The earth is rich in natural materials like water and trees，（32） ____ these materials are not endless．We use up our natural materials much （33） ____ than the earth is able to reproduce them．For example，each year we cut （34） ____ more than 6，000 square miles of forest．But it takes an average of 25 years for a new tree（35） ____ ．Recycling can help us save the earth，so let's take action right now． 26．A．use B．using C．is used D．used 27．A．another B．other C．others D．the other 28．A．who B．which C．how D．where 29．A．pollutes B．polluted C．polluting D．is polluted 30．A．When B．Whether C．Why D．If 31．A．then B．their C．it D．itself 32．A．but B．so C．and D．or 33．A．fastly B．fast C．faster D．fastest 34．A．out B．down C．in D．up 35．A．grows B．for growing C．growing D．to grow

It's very important that we all recycle （再利用）．In nature，everything （26） ____  again．For example，when an animal dies，it becomes （27） ____  animal's food．Nothing is wasted．But humans have created things like plastic bags（28） ____  can't be broken down by nature．Our rubbish kills animals and（29） ____  water and soil．（30） ____  we continue making too much rubbish，the problem will only get worse．If nature can't reuse the rubbish，we must recycle（31） ____ ．
We should clean up the rubbish we've made because nature can't．
Recycling is also the right thing to do for another reason．The earth is rich in natural materials like water and trees，（32） ____  these materials are not endless．We use up our natural materials much （33） ____  than the earth is able to reproduce them．For example，each year we cut （34） ____  more than 6，000 square miles of forest．But it takes an average of 25 years for a new tree（35） ____ ．
Recycling can help us save the earth，so let's take action right now．

26．A．use	B．using	C．is used	D．used
27．A．another	B．other	C．others	D．the other
28．A．who	B．which	C．how	D．where
29．A．pollutes	B．polluted	C．polluting	D．is polluted
30．A．When	B．Whether	C．Why	D．If
31．A．then	B．their	C．it	D．itself
32．A．but	B．so	C．and	D．or
33．A．fastly	B．fast	C．faster	D．fastest
34．A．out	B．down	C．in	D．up
35．A．grows	B．for growing	C．growing	D．to grow