Unnecessarily : অনাবশ্যকভাবে, অকারণে, খামাখা;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
In no time (শীঘ্র): He will finish the work in no time.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.