Heart-and-soul : সর্বান্তঃকরণে;
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Appropriate Prepositions
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Aware of(অবগত): I am not aware of his dishonesty.
Certain of(নিশ্চিত): Jamal is certain of his success.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Round the clock (সমস্ত দিন): He is working round the clock.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.
Without fail (অবশ্যই) - You must attend the meeting without fail.