Black-hearted : ক্রুরহৃদয়; ক্রূরমতি; ক্রূর;
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black-hearted  blackguard  See Words Also In
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Appropriate Prepositions
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Compete with(প্রতিযোগিতা করা): He does not pke to compete with
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
Without fail (অবশ্যই) - You must attend the meeting without fail.