19．Attention，please!British Airlines to Tokyo，flight number BA193will be boarding in 20minutes at Gate 4．

分析 請注意！英國航空公司前往東京的BA193次航班將于20分鐘后在4號門登機．

解答 答案：boarding
根據(jù)句意以及首字母的提示可知，此處的意思是：登機；由于此處用在助動詞will be之后，在句中作謂語，表達的是將來某一時間正在進行的動作，所以應填現(xiàn)在分詞形式構成將來進行時，故填boarding．

點評 做首字母填空題時，可根據(jù)句意以及首字母的提示判斷出空缺處的意思，從而確定出要填的單詞；然后從語法分析的角度，確定出應填單詞的形式；因此在平時的學習中，除了應牢固記憶單詞的拼寫之外，還要熟練掌握一些語法知識．

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