Keratin : শিং, নখ, চুল ইঃ গঠনকারী প্রোটিন;
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Appropriate Prepositions
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Due to (কারণে): His absence is due to illness.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
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Idioms
Far and wide (সর্বত্র): His fame spread far and wide.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Run short (কমতি পড়া) —I ran short of money.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Three score (ষাট): He is happy as his brother got three score.