Unthankfulness : কৃতঘ্নতা;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Careless of(অসতর্ক): Do not be careless of your health.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In no time (শীঘ্র): He will finish the work in no time.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.