In the first instance : প্রথমত; প্রথম অবস্থায়;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
For good (চিরদিনের জন্য): He left the house for good.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Without fail (অবশ্যই) - You must attend the meeting without fail.