Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Due to (কারণে): His absence is due to illness.
Make up of (গঠিত): Village is made up of many homes.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Of course (অবশ্যই): Of course, you know what that meant.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.