Cross multiplication : বজ্রগুণন;
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Appropriate Prepositions
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Independent of (স্বাধীন): They are independent of my health.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Now and then (মাঝে মাঝে): He comes here now and then.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.