Acknowledgment due : প্রাপ্তিস্বীকার পত্র;
Related Words
acknowledgement  acknowledgement receipt  acknowledgement slip  acknowledgements  acknowledgment  acknowledgment due  acknowledgments  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Conceal from(লুকানো) Do not conceal anything from me.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.