Prehistoric : প্রাগৈতিহাসিক;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Dwell in (বাস করা): He dwells in a tall apartment.
Easy of (সরল): The teacher is easy of approach.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
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Idioms
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Well off (স্বচ্ছল) - Jim and Della were not well off.