External angle : বহিঃস্থ কোণ;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
In the long run (পরিণামে): You will have to suffer in the long run.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Null and void (বাতিল): The deed has been null and void now.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.