At ones wits end : হতভম্ব; ভ্যাবাচাকা;
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Appropriate Prepositions
Certain of(নিশ্চিত): Jamal is certain of his success.
Easy of (সরল): The teacher is easy of approach.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
In no time (শীঘ্র): He will finish the work in no time.
Null and void (বাতিল): The deed has been null and void now.