6．The water should be boiled to make sure it is clean and safeto drink（drink）．

分析 水應(yīng)該被煮沸以確保干凈及飲用安全．

解答 答案：to drink
解析：分析句子結(jié)構(gòu)可知橫線前面的句子已經(jīng)完整，再根據(jù)括號(hào)內(nèi)所給詞提示而可知：水干凈及安全的"結(jié)果"是可以飲用，故此處應(yīng)該使用動(dòng)詞不定式表示結(jié)果．綜上，本題答案為：to drink．

點(diǎn)評(píng) 本題考查單詞填空，做此類(lèi)題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)，找出句子所缺成分并結(jié)合所給提示確定所填詞，再根據(jù)其它要求判斷所填詞的形式是否需要改變．

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