Mortality rate : মৃত্যুহার;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Caution against(সাবধান): Take all cautions against the danger.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
In no time (শীঘ্র): He will finish the work in no time.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.