Sharpness : তীক্ষ্ণতা; প্রাখর্য;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Aware of(অবগত): I am not aware of his dishonesty.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
For good (চিরদিনের জন্য): He left the house for good.
Set something right (ঠিক করা)— He will set the machine right.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.