15．Students are not allowed to leave the class early without the teacher's permission．

分析 未經(jīng)老師的許可學(xué)生不允許提早離開課堂．

解答 答案是permission．本題考查語境中選用恰當(dāng)?shù)脑~或短語的適當(dāng)形式．permission n．許可； without permission 未經(jīng)許可；故答案是permission．

點(diǎn)評(píng) 首字母填空必須在對(duì)語境整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等，結(jié)合首字母選用恰當(dāng)?shù)脑~，同時(shí)注意所選詞的形式變化．

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