Key-stone : খিলানোর মধ্য প্রস্তর; মূলকেন্দ্র
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Appropriate Prepositions
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
In full swing (পুরোদমে): The school is in full swing after the vacation.
In no time (শীঘ্র): He will finish the work in no time.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.