Authority letter : অধিকার-পত্র;
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Appropriate Prepositions
By heart (মুখস্থ): Kamal learnt to poem by heart.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Faith in (বিশ্বাস): I have no faith in him.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At times (মাঝে মাঝে): He at times comes here.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Up to (পর্যন্ত) - I have done the exercises up to page 40.