Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Pass away (মারা যাওয়া)— He passed away last night.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?