Radio-isotope : কোনো মৌলিক পদার্থের তেজস্ক্রিয় রূপ;
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Appropriate Prepositions
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Die of (রোগে মরা): Many people died of cholera.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Make up of (গঠিত): Village is made up of many homes.
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Idioms
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Short temper (রগচটা)— He is a man of short temper.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.