Keratin : শিং, নখ, চুল ইঃ গঠনকারী প্রোটিন;
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Appropriate Prepositions
Agree to(ব্যক্তি ছাড়া অন্যকিছুর সাথে একমত হওয়া): We cannot agree to your proposal.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.