Refractive index : প্রতিসরাঙ্ক;
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Appropriate Prepositions
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
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Idioms
Out of order (বিকল): The elevator was out of order.
Pass away (মারা যাওয়া)— He passed away last night.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Set free (মুক্ত করা): The prisoners were set free.