Blood donor : রক্তদানকারী;
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Appropriate Prepositions
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
Out of date (সেকেলে): This fashion is out of date.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
To the point (সঠিক) - The boy answered the question to the point.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.