Unchallengeable : অপরিবর্তনীয়;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Greed for (লোভ): He has an indomitable greed for wealth.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.