Noble metal : যে ধাতু সহজে জলে বা হাওয়ায় ক্ষয়ে যায় না বা সহজে অ্যাসিডের সঙ্গে বিক্রিয়া ঘটায় না;
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Close to(নিকটে): Our College is close to the Post Office.
Conscious of(সচেতন): I am conscious of my deficiencies.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
To the point (সঠিক) - The boy answered the question to the point.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.