At fault : কিংকর্তব্যবিমূঢ়;
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Appropriate Prepositions
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Faith in (বিশ্বাস): I have no faith in him.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Stare at (চাওয়া বা তাকানো): He stares at me.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.