Gun-cotton : নাইট্রিক ও সালফিউরিক এ্যাসিডে তুলা ভিজাইয়া যে তীব্র বিস্ফোরক দ্রব্য তৈরি হয়
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
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Idioms
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.