Confidential letter : গোপনীয় পত্র;
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Appropriate Prepositions
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Desist from (বিরত থাকা): She desisted from making this.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.