Non gratuitous : সশুল্ক বা সপরিশ্রমিক;
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Careless of(অসতর্ক): Do not be careless of your health.
Devoted to (মনোযোগী): He is devoted to music.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
For good (চিরদিনের জন্য): He left the house for good.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.