Crystalline rock : কেলাসিত শিলা;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Far and wide (সর্বত্র): His fame spread far and wide.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.