Laboriously : কঠোর পরিশ্রমসহকারে;
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Play on (বাজানো): They play on the piano.
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Idioms
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.
Well off (স্বচ্ছল) - Jim and Della were not well off.