Radio activity : তেজস্ক্রিয়তা;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.