Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Easy of (সরল): The teacher is easy of approach.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.