Cluster sampling : গুচ্ছের আদর্শ;
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Appropriate Prepositions
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Inquire for (দেখা করতে চাওয়া): He inquires for the manager.
Look for (খোঁজা): I was looking for the lost phone.
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Idioms
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Slow coach (অলস): You cannot expect much from a slow coach.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.
Without fail (অবশ্যই) - You must attend the meeting without fail.