12、For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, inter-office communications, not to mention newspapers and magazines: a never-ending flood of words. In _ _ 21 _ _ a job or advancing in one, the ability to read and comprehend quickly can mean the difference between success and failure. Yet the unfortunate fact is that most of us are _ _ 22 _ _ readers. Most of us develop poor reading habits at an early age, and never get over them. The main problem _ _ 23 _ _ in the actual stuff of language itself－words. Taken individually, words have little meaning until they are strung（连成） together into phrased, sentences and paragraphs. _ _ 24 _ _ , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing（倒退） to reread words or passages. Regression, the tendency to look back over what you have just read, is a common bad habit in reading. Another habit which _ _ 25 _ _ down the speed of reading is vocalization－sounding(用言语表达) each word either orally or mentally as one reads.