Obligatory : বাধ্যতামূলক, অবশ্যকরণীয়
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Appropriate Prepositions
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Detrimental to (অপকারী): Smoking is detrimental to health.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Easy of (সরল): The teacher is easy of approach.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Far and wide (সর্বত্র): His fame spread far and wide.
Null and void (বাতিল): The deed has been null and void now.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.