Mainspring : মুখ্য উদ্দেশ্য; ঘড়ির প্রধান চালক-স্প্রিং;
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Appropriate Prepositions
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Three score (ষাট): He is happy as his brother got three score.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.