Orthogonal : লম্ব; সমকোণীয়;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Care for(গ্রাহ্য করা): I do not care for you.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Solution to (সমাধান): None can solution to every problem.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Bad names (গালমন্দ—n) He called the man bad names.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.