Refractive index : প্রতিসরাঙ্ক;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Cause of(কারণ): Industry is the cause of your success.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Set something right (ঠিক করা)— He will set the machine right.