Stratosphere : বায়ুমন্ডলের স্তর বিশেষ;
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Appropriate Prepositions
Attention to(মনোযোগ): He has no attention to his studies.
Call in(ডাকিয়া আনা): They called in a doctor.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.