Sharpness : তীক্ষ্ণতা; প্রাখর্য;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Competent for(যোগ্য): He is not competent for the post.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Take into account (বিবেচনা করা): Your activities should be taken into account.