Helpfulness : উপকারিতা; কাজেরতা;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Detrimental to (অপকারী): Smoking is detrimental to health.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Due to (কারণে): His absence is due to illness.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Set something right (ঠিক করা)— He will set the machine right.