Radioactivity : তেজস্ক্রিয়তা;
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Hatred for (ঘৃণা): I have no hatred for anyone.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Set free (মুক্ত করা): The prisoners were set free.
To the brim (কানায় কানায়) - The river was full to the brim.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.