Unfalteringly : অবিচলিতচিত্তে; দ্বিধাহীনভাবে; নির্দ্বিধরূপে;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Charge with(অভিযুক্ত করা): He is charged with killing.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Crying need (জরুরী): Mass education is a crying need for India.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.