Circular letter : প্রচার পত্র;
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Appropriate Prepositions
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Identical with (একই ধরণের): You are identical with your sister.
Look at (তাকানো): Students look at the blackboard.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
For good (চিরদিনের জন্য): He left the house for good.
In vogue (চালু): This custom is not in vogue at present.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.