Development of knowledge : জ্ঞানোন্নতি;
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Appropriate Prepositions
Covetous of(লোভী হওয়া): He is covetous of wealth.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Lost in (মগ্ন): Simon is lost in meditation.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.