Non gratuitous : সশুল্ক বা সপরিশ্রমিক;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Due to (কারণে): His absence is due to illness.
Hatred for (ঘৃণা): I have no hatred for anyone.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
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.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Set free (মুক্ত করা): The prisoners were set free.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.