Alkali metal : ক্ষারধাতু;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Independent of (স্বাধীন): They are independent of my health.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.