Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Charge with(অভিযুক্ত করা): He is charged with killing.
Convert to(দীক্ষিত): Tom is converted to another religion.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Shocked at (মানসিক আঘাতপ্রাপ্ত): Snigdha was terribly shocked at the death of Ratul.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.