Choose the correct sequence to complete the text below. La...

Choose the correct sequence to complete the text below.
Language, brain and disability
It has often been remarked that we come to appreciate_____unique complexity and function of language only when it starts to go wrong. This happens daily in many small ways - when we detect ambiguity, express ourselves incoherently, or speak at cross-purposes. Less commonly, it happens in _____ dramatic and devastating manner, in _____ form of language disability. Those who find it difficult or impossible to communicate, on account of some physical, psychological, or other disability, face _____ frustrating, isolated, and uncertain future, in which their disability is often not recognized, and community support services may be inaccessible or absent. Drawing attention to ______ existence and extent of language disability is thus _____important role for any encyclopedia of language.
(Adapted from: The Cambridge Encyclopedia of language)