Non gratuitous : সশুল্ক বা সপরিশ্রমিক;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Lost in (মগ্ন): Simon is lost in meditation.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At a discount (অনাদৃত) Female education is no longer at a discount now.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
In vogue (চালু): This custom is not in vogue at present.
Up to (পর্যন্ত) - I have done the exercises up to page 40.