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13．PSAs are often run for free，and are meantto educate （educate） people about health，safety，or any other social problem．

分析 公益廣告往往是免費投放的，旨在教育人們關于健康，安全或其他社會性問題．

解答 答案是to educate．考查詞組be meant to do sth．：應該做某事，意在做某事．句意是：公益廣告往往是免費投放的，旨在教育人們關于健康，安全或其他社會性問題．故答案是to educate．

點評 解答此類題目首先要掌握句意，然后根據(jù)固定搭配和相關語法填寫正確的答案．

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