Commanding officer : অধিনায়ক অফিসার;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Bad at (অদক্ষ): He is not bad at English.
Identical with (একই ধরণের): You are identical with your sister.
Senior to (বয়সে বড়): He is senior to me by two years.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.