On cost : উপরি খরচা;
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Concerned with(জড়িত): She was concerned with such things.
Desire for (কামনা): He has no desire for fame.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
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Idioms
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.