Backward class : অনুন্নত সম্প্রদায়;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Care of(যত্ন নেওয়া): You should take care of your health.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
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.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.