Cluster sampling : গুচ্ছের আদর্শ;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Object to (আপত্তি করা): He objected to my proposal.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
For good (চিরদিনের জন্য): He left the house for good.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.