Keep secret : গোপন রাখা;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Call in question (সন্দেহ করা): No one can call his honesty in question.
In full swing (পুরোদমে): The school is in full swing after the vacation.
In vogue (চালু): This custom is not in vogue at present.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.