Quadrangular : চতুর্ভুজাকার;
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Appropriate Prepositions
Burst into(কান্নায় ভেঙ্গে পড়া): He burst into tears.
Care for(গ্রাহ্য করা): I do not care for you.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.