Open sesame : চিচিংফাঁক;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.