Sudden attack : অতর্কিত আক্রমণ;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Bad at (অদক্ষ): He is not bad at English.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Slow coach (অলস): You cannot expect much from a slow coach.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.