We produce lots of rubbish everyday. {#blank#}1{#/blank#} (take) away a city's rubbish is a big job. Every day trucks come into a city {#blank#}2{#/blank#} (collect) the rubbish. Most of it is made up of things we can't eat {#blank#}3{#/blank#} use. If we keep these things, we will have a mountain of rubbish soon.

    In some cities the rubbish. {#blank#}4{#/blank#} (carry) outside the city to a dump(垃圾场). The kitchen rubbish is broken into small pieces and sent into a sewage system(污水处理系统). {#blank#}5{#/blank#} sewage system takes away the used water {#blank#}6{#/blank#} toilets and other places.

    People usually use some earth to cover the dumped rubbish. Later, grass may be planted on the land. After all of these, the place looks much {#blank#}7{#/blank#} (clean) than before. With the beautiful environment in front of {#blank#}8{#/blank#} (we), it's hard to imagine that it used to be a rubbish dump. But actually it is not {#blank#}9{#/blank#} (health) to stay in such a place for a long time.

    In order to protect the cities, the rubbish is burnt in special places. The fire burns everything {#blank#}10{#/blank#} the metal. Sometimes the metal can be used again in factories. In those factories, the metal is made into different kinds of products.