Optional : ঐচিছক, স্বেচছামলক
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Appropriate Prepositions
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Easy of (সরল): The teacher is easy of approach.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.