Head assistant : প্রধান সহকারী;
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Appropriate Prepositions
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Play at (খেলা): I do not play at cards.
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Idioms
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.