Duty officer : কর্মরত আধিকারিক;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Due to (কারণে): His absence is due to illness.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Crying need (জরুরী): Mass education is a crying need for India.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.