Self-preservation : আত্মারক্ষার সহজাত প্রবৃত্তি; আত্মসংরক্ষণ; আত্মরক্ষা;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Call in(ডাকিয়া আনা): They called in a doctor.
Lost in (মগ্ন): Simon is lost in meditation.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
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Idioms
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Fair and square (সৎ): The learned persons should be fair and square.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.