By air mail : বিমান ডাকে;
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Appropriate Prepositions
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Due to (কারণে): His absence is due to illness.
Dwell in (বাস করা): He dwells in a tall apartment.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Out of order (বিকল): The elevator was out of order.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.