Tetrahedron : চতুস্তলক;
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Appropriate Prepositions
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Contribution to (অবদান): His invention made a major contribution to road safety.
Due to (কারণে): His absence is due to illness.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.