Quadrangular : চতুর্ভুজাকার;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Play on (বাজানো): They play on the piano.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Set out (যাত্রা করা)— I will set out in time.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.