People are trying to make the once polluted river clean again

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• People are trying to make the once polluted river clean again
• 缺词填空The ABC Island to be the home of many wild animals.It was very quiet and peoplecould only go there by s＿.But now there are more roads,buildings and people.A new fectory was built near it.The factory dumped its waste into the river.The poison in the waste killed fidh and plants and polluted the river.The government realized it and did something to stop it.Now the river is b＿ clean again.
• People are trying to make the once polluted river clean again
• 翻译课文,如果你知道此课文,支持全篇翻译（英语阅读与写作教程UNIT4 ABC三篇课文）Scientists are trying to make deserts into useful land once again.They want to bring water to deserts,so people can live and grow food.They are learning a lot about deserts but more and more of the earth is becoming deserts.Scientists mat not be able to change deserts.They think that people make deserts.They think taht people make deserts by doing bad things to the earth.
• He seemed to be very tired.同义句 ______that he was very tired.I ___(not suppose）that I'll trouble you again.The police___(confirm) that the victim obviously put up a good fight.The doctor said they could do nothing but ____(operate) on him at once.The police___(suspect)that the man is kidnapper.He _____(not dare)to swim in the river last year,because the river wa badly polluted.Now the water of river is clean.说明理由.
• 已经看了480页比剩下的多百分之60这本书共多少页?
• 已知方程（x-1）²=k²+2的一个根是x=3,求k的值和另外一个根.