Extemporaneous : অনিয়মিত; তত্ক্ষণিক; পূর্বপ্রস্তুতিহীন; অচিন্তিতপূর্ব; আকস্মিক; আপতিক; দৈবাৎ;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Infested with (অতিষ্ঠ): The room is infested with rats.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Null and void (বাতিল): The deed has been null and void now.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.