Keratin : শিং, নখ, চুল ইঃ গঠনকারী প্রোটিন;
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Appropriate Prepositions
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Greed for (লোভ): He has an indomitable greed for wealth.
Lost in (মগ্ন): Simon is lost in meditation.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.