Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Attain to (লাভ করা): He will not attain to his objective so soon.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Die of, for, from (মারা যাওয়া): He died of cholera. He died for his country. He died from an injury.
Easy of (সরল): The teacher is easy of approach.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.