Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Care for(গ্রাহ্য করা): I do not care for you.
Desire for (কামনা): He has no desire for fame.
Independent of (স্বাধীন): They are independent of my health.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Safe and sound (নিরাপদে)— He reached home safe and sound.