Extemporaneous : অনিয়মিত; তত্ক্ষণিক; পূর্বপ্রস্তুতিহীন; অচিন্তিতপূর্ব; আকস্মিক; আপতিক; দৈবাৎ;
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Appropriate Prepositions
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Solution to (সমাধান): None can solution to every problem.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.