In the picture : যথাযথরূপে অবগত বা বিদিত;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Make up of (গঠিত): Village is made up of many homes.
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Idioms
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Null and void (বাতিল): The deed has been null and void now.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.