Lack of knowledge : অজ্ঞান;
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Appropriate Prepositions
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Averse to (বিমুখ): Rahim was averse of your various problems.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Well off (স্বচ্ছল) - Jim and Della were not well off.