Biquadratic : চতুর্ঘাত;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.