Marginal cost : উপান্ত ব্যায়;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
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
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.