Origin of species : প্রজাতির উৎপত্তি; প্রজাতির উতপত্তি;
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Appropriate Prepositions
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Catch at(ধরা): A drowning man catches at a straw.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Faith in (বিশ্বাস): I have no faith in him.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.