Confidential letter : গোপনীয় পত্র;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Call for(চাওয়া): I will call for his explanation.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
On the whole (মোটের ওপর): On the whole, his conduct is good.
To the point (সঠিক) - The boy answered the question to the point.