As you may know, the best way to keep. yourself physically fit is to exercise everyday. The __21 __is that you should__ 22 __physical fitness part of your __23__ routine. It is the same with mental fitness.__24_ you want to be able to think well and to learn well, you __25__ exercise your mind daily. As with physical fitness," there are a __26__ of activities you can do to keep incontrol. However, over the__ 27__ run. the very best way to exercise your mind is to _28_the habit of reading. Here is why. Think of the difference between watching television and _29 __a book. Watching television is a passive experience. You sit, you look, and you listen. Such concentration is __30__ by outside stimulation(刺激). Reading a book, on the other hand, requires __31__ concentration.As you read. You must put in agreat deal of effort to look at the words.__ 32__out what they mean, and build up images,thoughts and opinions within your__ 33_ , During your reading. , if you atop concentrating,even __34__ a second,everything stops. Nothing happens until you start concentrating again. For this reason, reading regularly forces you to __35__ your powers of concentration, a skill whose value would be difficult to overpraise. A.thing B.problem C.trouble D.matter A.cause B.make C.bring D.turn A.daily B.weekly C.monthly D.quarterly A.Until B.Unless C.When D.if A.may B.must C.could D.would A.pair B.set C.few D.number A.long B.short C.quick D.slow A.change B.break C.support D.form A.reading B.writing C.editing D.Translating A.done B.divided C.driven D.drawn A.passive B.active C.low D.final A.figure B.take C.set D.look A.understanding B.reach C.field D.mind A.for B.at C.by D.in A.share B.seize C.decrease D.increase