Optimistic : আশাবাদী
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optimistic  optimistically  optimists  See Words Also In
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Appropriate Prepositions
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Conscious of(সচেতন): I am conscious of my deficiencies.
Detrimental to (অপকারী): Smoking is detrimental to health.
Infested with (অতিষ্ঠ): The room is infested with rats.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.