Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Call for(চাওয়া): I will call for his explanation.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
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Idioms
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.