Dimorphism : দ্বিরুপতা;
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Appropriate Prepositions
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Make of (কোনো উপকরণ দ্বারা সরাসরি তৈরী বোঝাতে): This necklace is made of gold.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Fair and square (সৎ): The learned persons should be fair and square.
Far and wide (সর্বত্র): His fame spread far and wide.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.