Patent office : পেটেন্ট অফিস; কৃতিস্বত্ব কার্যালয়;
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Appropriate Prepositions
Ascend to (আরোহণ করা): karim began to ascend to the surface of wakefulness.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.