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    1.When people think of factories, they think of clouds of dirty smoke or of pipes_________（倾泻）chemical waste into rivers。

    2.It also watches the river and stops the_________（非法的）hunting of animals, which has put the wild animals population at risk.

    3.A healthy environment is important for our__________(生存)．

    4.The efforts of the Chinese government and people to protect this much?loved river will be___________(感激) for years to come.

    5.Many people b _____________this change on gases such as carbon dioxide.

    6.Therefore, the more petrol and electricity we _________（消耗) , the more carbon we are to release.

    7.When the teacher entered the classroom, she found the pupils were a_________ in their Maths exercise.

    8.The price of oil has been on the d_________ recently.

    9.The whole family arranged a party to celebrate the new a_________.

    10.Teachers are supposed to give c_________ to (称赞)students, thus inspiring students in a positive way.

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