1．He was away from home for two years and we areconcerned （擔心的） about his safety．

分析 他離家兩年了，我們很擔心他的安全．

解答 concerned 考查固定短語．根據(jù)句意：他離家兩年了，我們很擔心他的安全．be concerned about是英語的固定搭配"擔心，掛念"．

點評 英語中的固定短語，既不能添詞，也不能少詞，是固定的，要求同學們在平時記憶準確，然后根據(jù)句意找出記憶中的固定搭配，做出正確的答案．

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