Through proper channel : যথাযথ প্রণালী-মাধ্যমে;
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Care for(গ্রাহ্য করা): I do not care for you.
Certain of(নিশ্চিত): Jamal is certain of his success.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
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Idioms
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.