Quadrivalent : চতুর্যোজী;
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Appropriate Prepositions
Appetite for(ক্ষুধা): He has no appetite for food.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Faith in (বিশ্বাস): I have no faith in him.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
To meet trouble half-way (পুরোপুরি মোকাবেলার আগেই হাল ছেড়ে দেয়া): He met trouble half way after getting the instructions.