Marginal cost : উপান্ত ব্যায়;
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Appropriate Prepositions
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
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Idioms
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.