A． because    B． First      C． but       D． from    E． filled      F． paper G． ill          H． room     I． young     J． Second   K．up       L． pulled

Last week， Green School had a Clean﹣up Day． Everyone tried their best to make the school more beautiful． They did different jobs．

Students（1） 　　Mr．Smith's class planted some（2） 　　trees．There used to be two big trees in the school． Students liked to play under them． The big trees were the symbol of the school． But they were cut down． Why？ Because they were（3） 　　．There was some kind of virus （病毒）．The virus was spreading to other trees． The schoolyard looked empty without them，so they decided to plant young trees． （4） 　　， they dug some small holes．Next， they put the trees in the holes．Then，they（5） 　　the holes with the good soil （土壤）． Finally， they tied the trees to small sticks to stop them from falling over．

Kids in Ms．Miller's class picked（6） 　　the rubbish． But plastic， glass and（7） 　　 __can be recycled． So it's important to put them in the right recycling bins． Of course， there are other bins for wet， dry and harmful things．

Ms．Black's class cleaned the meeting（8） 　　．Mr．Brown's students（9） 　　weeds（杂草） out of the garden beds． Miss White's class swept all the sidewalks．

It is hard work，（10） 　　everyone has such a strong feeling of satisfaction． They have made a cleaner and more beautiful school all together． For all students， school is their home． Everyone should play a part in keeping it clean and tidy．