Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Look at (তাকানো): Students look at the blackboard.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Now and then (মাঝে মাঝে): He comes here now and then.
Without fail (অবশ্যই) - You must attend the meeting without fail.