As firm as a rock : অটল; অচল; অনড়;
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Appropriate Prepositions
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Object to (আপত্তি করা): He objected to my proposal.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.