Immutability : অপরিবর্তনীয়তা; অপরিবর্ত্নশীলতা; নিত্যতা; অবিকার্যতা; বিকারহীনতা; অপরিবর্তনীয়তা;
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Bad at (অদক্ষ): He is not bad at English.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Devoted to (মনোযোগী): He is devoted to music.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.