At the expense of : ক্ষতি স্বীকার করিয়া;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Call for(চাওয়া): I will call for his explanation.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Desire for (কামনা): He has no desire for fame.
Free from (মুক্ত): He is now free from danger.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.