Vigilance : সতর্কতা; সতর্ক প্রহরা;
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Appropriate Prepositions
Bad at (অদক্ষ): He is not bad at English.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Convinced of (আশ্বস্ত): You are convinced of his product.
Dwell in (বাস করা): He dwells in a tall apartment.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At times (মাঝে মাঝে): He at times comes here.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.