Operating cost : চালন ব্যয়;
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Appropriate Prepositions
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Convinced of (আশ্বস্ত): You are convinced of his product.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.