Helpfulness : উপকারিতা; কাজেরতা;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Appetite for(ক্ষুধা): He has no appetite for food.
Cause of(কারণ): Industry is the cause of your success.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.