Prehistoric : প্রাগৈতিহাসিক;
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Appropriate Prepositions
Contribution to (অবদান): His invention made a major contribution to road safety.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
Crying need (জরুরী): Mass education is a crying need for India.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.