Perfunctory : উদাসীনভাবে বা অনিচছার সঙ্গে কৃৃত;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Hatred for (ঘৃণা): I have no hatred for anyone.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.