Nigrescence : কৃষ্ণতা;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Contribution to (অবদান): His invention made a major contribution to road safety.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
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Idioms
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Round the clock (সমস্ত দিন): He is working round the clock.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.
Worthy of (যোগ্য) - He is worthy of a good job.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.