External angle : বহিঃস্থ কোণ;
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Appropriate Prepositions
Contribution to (অবদান): His invention made a major contribution to road safety.
Inquire of, about, into, after (অনুসন্ধান করা): Roma inquired of me about my father’s health. The pope will inquire into the cause of fire. Mehjabin inquired after her friends.
Regret for (দুঃখ করা): We regretted for his failure.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.