Vertical angles : শিরঃকোণ;
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Appropriate Prepositions
Caution against(সাবধান): Take all cautions against the danger.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Die of, for, from (মারা যাওয়া): He died of cholera. He died for his country. He died from an injury.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Set free (মুক্ত করা): The prisoners were set free.
To the point (সঠিক) - The boy answered the question to the point.