At source : অর্থলাভ ইত্যাদির উৎসমূলে;
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Appropriate Prepositions
Complain about (কোনো বিষয়ে নালিশ করা): They complained about the mismanagement of the programme.
Indulge in (আসক্ত): You should not indulge in social media.
Inquire for (দেখা করতে চাওয়া): He inquires for the manager.
Lost in (মগ্ন): Simon is lost in meditation.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
Bad names (গালমন্দ—n) He called the man bad names.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Run short (কমতি পড়া) —I ran short of money.
Slow coach (অলস): You cannot expect much from a slow coach.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.