The rubbish grew constantly and began to __6__. Sometimes it caught fire, sending heavy __7__ into the air and making __8__ hard for everyone to breathe. Dumptowners tried moving away from the mess, but __9__ they moved, the problem was still there. They knew they had to __10__ it.

　　They learned to __11__ the amount of waste they threw away. For example, they bought items at the store that __12__ covered in extra packaging, so there would be __13__ to throw away. They learned to reuse other things—like washing out __14__ jars instead of throwing them away. And, they learned to recycle. They set up __15__ around towns for people to put in waste that could be __16__ materials, and then into new __17__.

　　Dumptowners paid special attention to __18__ waste and set up special collection points for safe handling. Instead of __19__ environmentally harmful cleaning products or chemicals from the market, many Dumptowners switched to natural, safe products.

　　Finally, they __20__ the old city dump and built a new factory outside the town which was used to handle waste. With the town's new look, it needed a new name, and Recycle City was born.

　　1．A.question

　　B．problem

　　C．difference

　　D．difficulty

　　2．A.which

　　B．how

　　C．why

　　D．what

　　3．A.knew

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