8．It's very polite to say"Thank you"when someone helps you．

分析 首先整體上理解句意：當(dāng)有人幫助你時，說聲謝謝你，是非常有禮貌的．

解答 根據(jù)句意當(dāng)有人幫助你時，說聲謝謝你，是非常有禮貌的，故填：polite

點(diǎn)評 It's adj．to do sth．表示去做某事…做此類題應(yīng)先理解句意，然后再確定單詞的形式

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