Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Care of(যত্ন নেওয়া): You should take care of your health.
Free from (মুক্ত): He is now free from danger.
Object to (আপত্তি করা): He objected to my proposal.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
In the long run (পরিণামে): You will have to suffer in the long run.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.