Equi-marginal utility : সমউপান্তিক উপযোগ;
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Appropriate Prepositions
Defend against (রক্ষা করা): We will defend our country against all enemies.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Make up of (গঠিত): Village is made up of many homes.
Play at (খেলা): I do not play at cards.
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Idioms
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.