Unprecedented : নজিরহীন; অভূতপূর্ব;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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 at once - (হঠাৎ): I feel terribly sleepy all at once.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.