Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Indulge in (আসক্ত): You should not indulge in social media.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Set out (যাত্রা করা)— I will set out in time.