Demographer : জনতত্ত্ববিদ;
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Appropriate Prepositions
Conscious of(সচেতন): I am conscious of my deficiencies.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Due to (কারণে): His absence is due to illness.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
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.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.