Right angled : সমকোণী;
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Appropriate Prepositions
Attention to(মনোযোগ): He has no attention to his studies.
Convinced of (আশ্বস্ত): You are convinced of his product.
Look for (খোঁজা): I was looking for the lost phone.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Now and then (মাঝে মাঝে): He comes here now and then.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.