Marginal cost : উপান্ত ব্যায়;
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Appropriate Prepositions
Appropriate to(যোগ্য): His answer is appropriate to the question.
Cause of(কারণ): Industry is the cause of your success.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Indulge in (আসক্ত): You should not indulge in social media.
Inquire of, about, into, after (অনুসন্ধান করা): Roma inquired of me about my father’s health. The pope will inquire into the cause of fire. Mehjabin inquired after her friends.
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Idioms
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Out of order (বিকল): The elevator was out of order.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.