Criminal investigation department : অপরাধ অনুসন্ধান বিভাগ;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.