Key-stone : খিলানোর মধ্য প্রস্তর; মূলকেন্দ্র
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Call in(ডাকিয়া আনা): They called in a doctor.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Look for (খোঁজা): I was looking for the lost phone.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.