Sound-proof : শব্দনিরোধক;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Lump sum (এক কালীন) — He gave us lump sum money.
Take into account (বিবেচনা করা): Your activities should be taken into account.