Silkworm : রেশমগুটি; গুটিপোকা;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Free from (মুক্ত): He is now free from danger.
Quick at (চটপটে): A cashier must be quick at figures.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
In vogue (চালু): This custom is not in vogue at present.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.