Random sampling : যদৃচ্ছা নমুনা সংগ্রহ;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.