Keratin : শিং, নখ, চুল ইঃ গঠনকারী প্রোটিন;
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Appropriate Prepositions
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Appropriate to(যোগ্য): His answer is appropriate to the question.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Indulge in (আসক্ত): You should not indulge in social media.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.