Overhead cost : স্থির ব্যয়;
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Appropriate Prepositions
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Catch at(ধরা): A drowning man catches at a straw.
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Infested with (অতিষ্ঠ): The room is infested with rats.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Without fail (অবশ্যই) - You must attend the meeting without fail.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.