Check and balance : রোধন ও সমন্বয়ন;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Free from (মুক্ত): He is now free from danger.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.