Non gratuitous : সশুল্ক বা সপরিশ্রমিক;
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Appropriate Prepositions
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Decide upon (সিদ্ধান্ত করা): We have not yet decided whether we are going to picnic.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Regard for (সম্মান): Good boys have great regard for their teachers.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.