Catoptrics : ক্যাটপ্টরিক্স;
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Appropriate Prepositions
Concerned with(জড়িত): She was concerned with such things.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Contribution to (অবদান): His invention made a major contribution to road safety.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.