Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Averse to (বিমুখ): Rahim was averse of your various problems.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.