Spontaneous : স্বত:স্ফূর্ত, স্বেচ্ছাবৃত্ত;
Related Words
spontaneous  spontaneously  spontaneousness  See Words Also In
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.