Gratuitously : অবাঞ্ছিতভাবে; অযৌক্তিকভাবে; বিনা পয়সায়; বিনা দক্ষিণায়;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Round the clock (সমস্ত দিন): He is working round the clock.