Asperity : ব্যবহারের রুক্ষতা;
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asperities  asperity  aspirate  See Words Also In
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Independent of (স্বাধীন): They are independent of my health.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.