Quadrangle : চতুর্ভুজ সমতল ক্ষেত্র;
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Bad at (অদক্ষ): He is not bad at English.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Run into (জড়িয়ে পড়া): He had run into debt.
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Idioms
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.