Caustic alkali : তীক্ষ্ণক্ষার;
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Appropriate Prepositions
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Remedy for (প্রতিকার): There is no remedy for cancer.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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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 the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.