Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Of course (অবশ্যই): Of course, you know what that meant.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.