Caustic alkali : তীক্ষ্ণক্ষার;
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Appropriate Prepositions
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Careless of(অসতর্ক): Do not be careless of your health.
Free from (মুক্ত): He is now free from danger.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Safe and sound (নিরাপদে)— He reached home safe and sound.
To the point (সঠিক) - The boy answered the question to the point.