7．Rescuers were engagedin an all-night effort to reach the survivors before their supply ofair ran out．

分析 營救隊員通過一整夜的努力爭取在空運物資耗盡之前抵達幸存人員身邊．

解答 答案：engaged．
分析句子的內(nèi)容可知，結(jié)合句意及首字母可知本句考查短語be engaged in忙于做某事；故答案為engaged．

點評 首字母填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．同時還要注意提示字母．

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