Right angles : সমকোণ;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Ascend from (উপরে ওঠা): Rahim watched the mist ascending from the valley.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Catch at(ধরা): A drowning man catches at a straw.
Convert to(দীক্ষিত): Tom is converted to another religion.
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Idioms
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.