Certificate of competency : যোগ্যতাপত্র;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Object to (আপত্তি করা): He objected to my proposal.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.