Sound-proof : শব্দনিরোধক;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Competent for(যোগ্য): He is not competent for the post.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
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Idioms
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
To the brim (কানায় কানায়) - The river was full to the brim.