完形填空。 One day, a young man asked Albert Einstein, the great German scientist, which the secret of success was. The scientist 1 him that the secret of success is hard work. A few days 2_ the young man asked him the 3 question again. Einstein was very 4 . He did not say 5 , but wrote a few 6 on a piece of paper and handed it to the young man. The young man looked 7 the piece of paper. On  it was written: A=X+Y+Z.'What 8 this mean?'asked the young man.'A means success,'  said the old  scientist.'X means hard work, Y means good methods, and Z means 9 talking and start to 10 . (     )1. A. told (     )2. A. ago (     )3. A. easy (     )4. A. worried (     )5. A. anything (     )6. A. words (     )7. A. on (     )8. A. will (     )9. A. go on (     )10. A. work B. said B. before B. good B. happy B. something B.  sentence B. up B. shall B. stop B. read C. talked C. later C. same C. angry C. nothing C. word C. down C. does C. enjoy C. write