Working efficiency : কার্যক্ষমতা;
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Convinced of (আশ্বস্ত): You are convinced of his product.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Object to (আপত্তি করা): He objected to my proposal.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Fair and square (সৎ): The learned persons should be fair and square.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.