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.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Catch at(ধরা): A drowning man catches at a straw.
Consist of(গঠিত হওয়া): The committee consists of ten members.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
In no time (শীঘ্র): He will finish the work in no time.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.