Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Call in(ডাকিয়া আনা): They called in a doctor.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.