Profi ciency : দক্ষতা; কুশলতা; বু্যত্পত্তি;
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profi ciency  proficiencies  proficiency  See Words Also In
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.