Alertness : সতর্কতা;
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Appropriate Prepositions
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Competent for(যোগ্য): He is not competent for the post.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.