Glass wool : কাচতন্তু; কাচের সূক্ষ্ম তন্তু;
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Appropriate Prepositions
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Due to (কারণে): His absence is due to illness.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.