Mental arithmetic : মানসাঙ্ক;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Attain to (লাভ করা): He will not attain to his objective so soon.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Call in(ডাকিয়া আনা): They called in a doctor.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.
Well off (স্বচ্ছল) - Jim and Della were not well off.