Read the following text from which 10 words have been removed. Choose from the words A—O the most suitable one to fill each numbered gap in the text (1 - 5). There are FIVE extra words that you do not need to use.
     Some of the greatest successes you can think of began with failure. What a big  a little continued effort and determination can make.
     Workplace expert Nan Russell，author of “ The Titleless Leader：How to Get Things Done When You ’ re Not in Charge，” offers a number of  of people who were deemed failures—and then turned successful.
     Albert Einstein was  to be mentally challenged as a child and told he would never amount to anything. Need we say how that one turned out?
     Walt Disney was fired from the Kansas City Star because the editor thought he lacked .
     Chester Carlson’s early Xerox machines were  by 20 companies before he finally found a business partner.
     Thomas Edison failed thousands of times before inventing the light bulb. There are many quotes from the great inventor that are worth  to memory. Here’ s just one：“ Many of life’s failures are people who did not realize how  they were to success when they gave up. ”
     So, while failure may not feel good, it，s often an essential part of success, the trial-and-error that can lead to greater things. If you spend all your time  about past mistakes, you might not notice when real opportunity arrives，so by all , learn from your mistakes —then put them behind you, roll up your sleeves and get back to work.
     Here’ s one more quote from Edison for us to think about : “If we all did the things we are  of, we would astound ourselves. ’’