Officer on special duty : বিশেষ কর্মে নিযুক্ত অফিসার;
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Conscious of(সচেতন): I am conscious of my deficiencies.
Hatred for (ঘৃণা): I have no hatred for anyone.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.