Refracting index : প্রতিসরাঙ্ক;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Zeal for (উৎসাহ): Forhad has great zeal for cricket.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Greed for (লোভ): He has an indomitable greed for wealth.
With a view to (উদ্দেশ্য): I went to hospital with a view to seeing you.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Three score (ষাট): He is happy as his brother got three score.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.