Cluster sampling : গুচ্ছের আদর্শ;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Run short (কমতি পড়া) —I ran short of money.
Safe and sound (নিরাপদে)— He reached home safe and sound.