Plano-concave : সমাবতল;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.