Vigilance : সতর্কতা; সতর্ক প্রহরা;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Apology to (কারো কাছে ক্ষমা চাওয়া): Rakib should ask apology to her.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Attacked with(আক্রান্ত): He is attacked with …
Call in(ডাকিয়া আনা): They called in a doctor.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
To the point (সঠিক) - The boy answered the question to the point.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.