Ossein : হাড়ের জৈব উপাদান;
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Appropriate Prepositions
Caution against(সাবধান): Take all cautions against the danger.
Due to (কারণে): His absence is due to illness.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Play on (বাজানো): They play on the piano.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Set free (মুক্ত করা): The prisoners were set free.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.