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    18．My mom always tells me that Icannot be careful enough no matter what I do．

    分析 妈妈总是告诉我无论做什么都是越小心越好．

    解答 答案是can．
    本题考查情态动词can的用法．情态动词can常常用在"can not/never+too/over/enough"的结构中表示"越…越好"，或"无论怎样也不为过"．根据句意和常识可知，无论做什么，"越小心越好"，所以答案用can．

    点评 本题考查情态动词，要在正确理解情态动词的基本含义的基础上，整体理解语境中的情感态度，做出合理的判断．

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