Cluster sampling : গুচ্ছের আদর্শ;
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Appropriate Prepositions
Catch at(ধরা): A drowning man catches at a straw.
Conceal from(লুকানো) Do not conceal anything from me.
Make up of (গঠিত): Village is made up of many homes.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
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Idioms
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.