Mercilessly : ক্ষমাহীনভাবে;
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Appropriate Prepositions
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Play at (খেলা): I do not play at cards.
Senior to (বয়সে বড়): He is senior to me by two years.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.