Quadrivalent : চতুর্যোজী;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Apology to (কারো কাছে ক্ষমা চাওয়া): Rakib should ask apology to her.
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Appetite for(ক্ষুধা): He has no appetite for food.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
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Idioms
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Lump sum (এক কালীন) — He gave us lump sum money.
Run short (কমতি পড়া) —I ran short of money.