Unproductive : অফলপ্রসূ; নিষ্ফলা;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Run into (জড়িয়ে পড়া): He had run into debt.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Well off (স্বচ্ছল) - Jim and Della were not well off.