Caustic alkali : তীক্ষ্ণক্ষার;
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Appropriate Prepositions
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Certain of(নিশ্চিত): Jamal is certain of his success.
Dwell in (বাস করা): He dwells in a tall apartment.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.