Competent authority : যোগ্য অধিকারী;
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Appropriate Prepositions
Appetite for(ক্ষুধা): He has no appetite for food.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
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.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.