Duty officer : কর্মরত আধিকারিক;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Run on (বিরতিহীন চলা): The bus is running on time.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.