Prehistoric : প্রাগৈতিহাসিক;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Contribution to (অবদান): His invention made a major contribution to road safety.
Look at (তাকানো): Students look at the blackboard.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
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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.
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.