Crash helmets : শিরস্ত্রাণ;
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Appropriate Prepositions
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
To the brim (কানায় কানায়) - The river was full to the brim.