Necessary : অপরিহার্য, প্রয়োজনীয়
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Contribution to (অবদান): His invention made a major contribution to road safety.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bad names (গালমন্দ—n) He called the man bad names.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.