Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Averse to (বিমুখ): Rahim was averse of your various problems.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.