p;                       li hua

　　13.                             pollution

　　     a chemical factory lies near my home. the manager was criticized by the government because the pollution had harmed people’s health, but he paid no attention. then the factory was forced to stop production and the manager said angrily, “ is there any fact that we have harmed people’s health? in fact, we haven’t.” just then, a doctor came, with the result of the medical exam of the manager, saying the manager was suffering a lung cancer. it is very clear that the population has harmed not only to people’s health but also the manager himself. he was realized the importance of keeping air clean.

　　14. fire causes

　　fir

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