Mental arithmetic : মানসাঙ্ক;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Desist from (বিরত থাকা): She desisted from making this.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Fair and square (সৎ): The learned persons should be fair and square.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Now and then (মাঝে মাঝে): He comes here now and then.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.