Step sister : সৎবোন;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Make up of (গঠিত): Village is made up of many homes.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
For good (চিরদিনের জন্য): He left the house for good.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.