Interdepartmental : আন্তর্বিভাগীয়; অন্তর্বিভাগীয়;
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inter-departmental  interdepartmental  See Words Also In
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Appropriate Prepositions
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Infested with (অতিষ্ঠ): The room is infested with rats.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Fair and square (সৎ): The learned persons should be fair and square.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Up to (পর্যন্ত) - I have done the exercises up to page 40.