Working efficiency : কার্যক্ষমতা;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Lost in (মগ্ন): Simon is lost in meditation.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.