Anonymous letter : উড়োচিঠি;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Attain to (লাভ করা): He will not attain to his objective so soon.
Conceal from(লুকানো) Do not conceal anything from me.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Out of order (বিকল): The elevator was out of order.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.