Dimorphism : দ্বিরুপতা;
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Appropriate Prepositions
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Capable of(সক্ষম): He is capable of doing it.
Easy of (সরল): The teacher is easy of approach.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
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Idioms
In vogue (চালু): This custom is not in vogue at present.
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.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
Worthy of (যোগ্য) - He is worthy of a good job.