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11．How to useelectricity safely has become general knowledge in our class．（electric）

分析怎樣安全用電已經成為我們班的常識．

解答答案：electricity．
句中use表示使用是個及物動詞，后直接加上名詞，所給單詞electric是形容詞表示"電的"，它的名詞是electricity"電"的含義，use electricity表示用電，故答案是electricity．

點評本題通過及物動詞use得出空格部分的詞性，構成名詞的是ity后綴的單詞還有reality現實，ability能力，activity活動，possibility可能性，regularity正規，nationality國籍，disability殘疾等

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