Betterment fee : উন্নয়ন দক্ষিণা;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Aware of(অবগত): I am not aware of his dishonesty.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.