Unchallengeable : অপরিবর্তনীয়;
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Desist from (বিরত থাকা): She desisted from making this.
Free from (মুক্ত): He is now free from danger.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Out of order (বিকল): The elevator was out of order.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.