Cosmopolitism : বিশ্বনাগরিক তত্ব;
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Appropriate Prepositions
Care of(যত্ন নেওয়া): You should take care of your health.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.