Black marketing : অপপণন; চোরা কারবার;
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Appropriate Prepositions
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Caution against(সাবধান): Take all cautions against the danger.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.