Betterment tax : উন্নয়ন-কর;
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Appropriate Prepositions
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Bad at (অদক্ষ): He is not bad at English.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Solution to (সমাধান): None can solution to every problem.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
In vogue (চালু): This custom is not in vogue at present.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.