Co-operator : সহযোগী; সহায়ক;
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Appropriate Prepositions
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Greed for (লোভ): He has an indomitable greed for wealth.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
Set something right (ঠিক করা)— He will set the machine right.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.