完形填空

　　"Eyes are windows of the soul．" Everyone knows the 　　1　　 of the eyes．　　2　　 more and more students are becoming near-sighted(近视)．So how to protect the eyes is still a serious problem．Here is some advice on 　　3　　 protect your eyesight(视力)．

　　You should not keep your eyes 　　4　　 for a long time．When reading, you should keep the books about a foot away from you．After reading for an hour 　　5　　 two, you 'd better have a 　　6　　 by looking into the distance(远处)．

　　You must remember not to read in dark light or in 　　7　　, not to read on a moving bus or in bed．Doing eye exercises will help 　　8　　 to protect your eyesight．

　　In a 　　9　　, to keep 　　10　　 eyesight, we must have good studying habits．