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a substance that improves the efficiency of a catalyst is called a promoter.

a part of speech that takes the place of a noun. There are various types of pronouns. See...

some pronouns always take a singular verb, e.g. no-one, none, nobody, everybody.

the final part of the editing process that involves checking the work again to make sure that it...

(theatrical property or stage prop) an object used on stage by actors during the performance of...

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