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.

    "Thank you" is widely {#blank#}1{#/blank#}(use) in the modern society. It is a very good manner. You should say "Thank you" {#blank#}2{#/blank#}others help you or say something kind to you. For example, when someone {#blank#}3{#/blank#}the door for you, when someone says you have done a good job, when someone says you have {#blank#}4{#/blank#}(buy) a nice shirt, or your city {#blank#}5{#/blank#}

very beautiful, you should say "Thank you". "Thank you" is not only used between friends, but also used {#blank#}6{#/blank#}parents and children, brothers and sisters, husbands and wives.

    "Excuse me" is {#blank#}7{#/blank#}(other) short polite usage. We use it as often as "Thank you". When you hear someone say so behind you, you'd get to know that somebody wants to walk past you without {#blank#}8{#/blank#}(touch) you. It is not polite to interrupt(打断) others while they {#blank#}9{#/blank#}(talk). If you want to have a word with one of them, please say "Excuse me" {#blank#}10{#/blank#}(one), and then begin to talk. You should also do so when you want to cough or make any unpleasant noise before others. Let's say "Thank you" and "Excuse me" on the right occasion.