Cross multiplication : বজ্রগুণন;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Repent on (নির্ভরশীল): He is repent on his parents.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
To the brim (কানায় কানায়) - The river was full to the brim.