Extension officer : সম্প্রসারণ অফিসার;
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Detrimental to (অপকারী): Smoking is detrimental to health.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Good for, at (ভাল): This man is good for nothing. He is good at English.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
To the point (সঠিক) - The boy answered the question to the point.