Extemporaneous : অনিয়মিত; তত্ক্ষণিক; পূর্বপ্রস্তুতিহীন; অচিন্তিতপূর্ব; আকস্মিক; আপতিক; দৈবাৎ;
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Appropriate Prepositions
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Far and wide (সর্বত্র): His fame spread far and wide.
On the whole (মোটের ওপর): On the whole, his conduct is good.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.