Plano-concave : সমাবতল;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Bad at (অদক্ষ): He is not bad at English.
Free from (মুক্ত): He is now free from danger.
Make of (কোনো উপকরণ দ্বারা সরাসরি তৈরী বোঝাতে): This necklace is made of gold.
Make up of (গঠিত): Village is made up of many homes.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
All along - (সব সময়): I was present in the meeting all along.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.