Caustic alkali : তীক্ষ্ণক্ষার;
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Appropriate Prepositions
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
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Idioms
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
To the point (সঠিক) - The boy answered the question to the point.