Quadrangular : চতুর্ভুজাকার;
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Appropriate Prepositions
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Object to (আপত্তি করা): He objected to my proposal.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.