14．It's a demand that when having a class one always concentrate on teachers．

分析 要求上課時(shí)一個(gè)人總是要將注意力集中到老師身上．

解答 答案：concentrate 考查首字母填空．根據(jù)句意和句子結(jié)構(gòu)，要填入動(dòng)詞，concentrate on意為""，在demand的主語從句中，要用虛擬語氣，謂語動(dòng)詞用should+動(dòng)詞原形，should可省略．

點(diǎn)評(píng) 考查首字母填空，準(zhǔn)確地理解句子、翻譯句子，然后根據(jù)句意及提示寫出單詞，完成句子，使句意更通順．

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