Right angles : সমকোণ;
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Appropriate Prepositions
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Certain of(নিশ্চিত): Jamal is certain of his success.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
In no time (শীঘ্র): He will finish the work in no time.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.