4．Worrying andlackof sleep can lead to failure in tests or exams，which is a big problem for many students．

分析 擔(dān)憂和缺乏睡眠會(huì)導(dǎo)致考試失敗，這是許多學(xué)生所面臨的一個(gè)大問題．

解答 答案：lack of
分析句意可知，本句的主語應(yīng)是：擔(dān)憂和缺乏睡眠，故此處考查的是固定短語lack of（缺乏；不足）的用法；故填lack of．

點(diǎn)評(píng) 做類似的題時(shí)，首先應(yīng)根據(jù)句意判斷出空缺處的意思；其次從語法分析的角度，確定出應(yīng)填單詞的形式；因此在平時(shí)的學(xué)習(xí)中，除了應(yīng)牢固記憶單詞的拼寫之外，還要熟練掌握一些的語法知識(shí)．

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