Secret agent : গুপ্তচর;
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Appropriate Prepositions
Careful of (সতর্ক): He is very careful of his fault.
Faith in (বিশ্বাস): I have no faith in him.
Look at (তাকানো): Students look at the blackboard.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.