Sound-wave : শব্দতরঙ্গ;
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Object to (আপত্তি করা): He objected to my proposal.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Regard for (সম্মান): Good boys have great regard for their teachers.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Round the clock (সমস্ত দিন): He is working round the clock.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.