Tetrahedral : চতুস্তল;
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Identical with (একই ধরণের): You are identical with your sister.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Now and then (মাঝে মাঝে): He comes here now and then.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.