First hand knowledge : মৌল জ্ঞন;
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Appropriate Prepositions
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Close to(নিকটে): Our College is close to the Post Office.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
To the brim (কানায় কানায়) - The river was full to the brim.
To meet trouble half-way (পুরোপুরি মোকাবেলার আগেই হাল ছেড়ে দেয়া): He met trouble half way after getting the instructions.
Up to (পর্যন্ত) - I have done the exercises up to page 40.