Free of cost : নিখরচা;
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Appropriate Prepositions
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.