Most smokers want to stop smoke. Many of 【76】______ them have tried more than once but failed. 【77】

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问题     Most smokers want to stop smoke. Many of              【76】______
    them have tried more than once but failed.            【77】______
    Although they know smoking may kill them and          【78】______
    cause a serious illness yet they can give it up.      【79】______
    The reason to it is that tobacco contains nicotine    【80】______
    that is a drug which gets one into habit of smoking.  【81】______
    Because you start taking the drug, it is hard to stop.【82】______
    If you go without it for an hour or two, it           【83】______
    begin to feel bad. The only thing can stop            【84】______
    you feeling bad is the drug containing in cigarettes. 【85】______

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答案Because改成Once/If

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