Unthankfulness : কৃতঘ্নতা;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Bar to(বাধা): Poverty is not a bar to happiness.
Call for(চাওয়া): I will call for his explanation.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.