Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Add to (বৃদ্ধি করা, যোগ করা): The doll-dance in the exhibition added to our pleasure.
Adept in (দক্ষ): He is adept in playing football.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Look for (খোঁজা): I was looking for the lost phone.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Without fail (অবশ্যই) - You must attend the meeting without fail.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.