Unperturbedly : অকাতরে;
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Attain to (লাভ করা): He will not attain to his objective so soon.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.