Allergen : অতিপ্রতিক্রিয়া সৃষ্টিকারী বস্তু;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Angry with(কারো সাথে ক্রুদ্ধ হওয়া): The teacher was very angry with the students.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
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Idioms
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
In the long run (পরিণামে): You will have to suffer in the long run.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.