Angle of reflection : প্রতিফলন কোণ;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
In the long run (পরিণামে): You will have to suffer in the long run.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.