Confidential letter : গোপনীয় পত্র;
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Appropriate Prepositions
Abhorrence of (ঘৃণা): Everyone should have abhorrence of a par.
Affectionate to(স্নেহশীল): He is very affectionate to his baby.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Indulge in (আসক্ত): You should not indulge in social media.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
In vogue (চালু): This custom is not in vogue at present.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Now and then (মাঝে মাঝে): He comes here now and then.