Drainage system : জলনির্গমন-প্রণালী;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Look at (তাকানো): Students look at the blackboard.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.
Up to (পর্যন্ত) - I have done the exercises up to page 40.