Fountain-head : উত্সমুখ; আদি; আদি উত্স; সূত্রপাত;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Bad at (অদক্ষ): He is not bad at English.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Repent of (অনুতাপ করা): I repented of my past.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.