Mercilessly : ক্ষমাহীনভাবে;
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Appropriate Prepositions
Appropriate to(যোগ্য): His answer is appropriate to the question.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Infested with (অতিষ্ঠ): The room is infested with rats.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
In full swing (পুরোদমে): The school is in full swing after the vacation.
In no time (শীঘ্র): He will finish the work in no time.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.