Unfortunately : দুর্ভাগ্যবশত; দুর্ভাগ্যক্রমে;
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Appropriate Prepositions
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.