Radio-isotope : কোনো মৌলিক পদার্থের তেজস্ক্রিয় রূপ;
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Appropriate Prepositions
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.