Unfamiliarity : অপরিচিতি; অনভ্যাস;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Round the clock (সমস্ত দিন): He is working round the clock.