Pentavalent : পঞ্চ-যোজ্যতাযুক্ত;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
On the wane (হ্রাসমান): His fame is on the wane now.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Without fail (অবশ্যই) - You must attend the meeting without fail.