Optimistically : আশাবাদী হওয়া;
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Appropriate Prepositions
Careless of(অসতর্ক): Do not be careless of your health.
Caution against(সাবধান): Take all cautions against the danger.
Fantasize about (কল্পনা করা): They fantasized about winning the lottery.
Solution to (সমাধান): None can solution to every problem.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Out of order (বিকল): The elevator was out of order.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Set something right (ঠিক করা)— He will set the machine right.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.