Harmless : নির্দোষ, নিরীহ, অক্ষত
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Certain of(নিশ্চিত): Jamal is certain of his success.
Complain about (কোনো বিষয়ে নালিশ করা): They complained about the mismanagement of the programme.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
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Idioms
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
In vogue (চালু): This custom is not in vogue at present.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.