Co-operator : সহযোগী; সহায়ক;
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Appropriate Prepositions
Abhorrence of (ঘৃণা): Everyone should have abhorrence of a par.
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Remind of (স্মরণ করিয়ে দেওয়া): He reminded me of his request to lend him some money.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.