Firsthand : সরাসরি; হাতে-কলমে;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Call in(ডাকিয়া আনা): They called in a doctor.
Cause of(কারণ): Industry is the cause of your success.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.