Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.