Radio-isotope : কোনো মৌলিক পদার্থের তেজস্ক্রিয় রূপ;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Bad at (অদক্ষ): He is not bad at English.
Desire for (কামনা): He has no desire for fame.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.