Without hesitation : অম্লানবদনে;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.