Random sampling : যদৃচ্ছা নমুনা সংগ্রহ;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Averse to (বিমুখ): Rahim was averse of your various problems.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Set something right (ঠিক করা)— He will set the machine right.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.