Cluster sampling : গুচ্ছের আদর্শ;
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Make up of (গঠিত): Village is made up of many homes.
Plead for (ওকালতি করা): He pleads for justice.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Round the clock (সমস্ত দিন): He is working round the clock.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.