review of M9

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Across
  1. 5. English book, maths book,etc
  2. 8. ｂｅ　known　ｂｙ　more　ａｎｄ　more　people
  3. 9. your friend give sth to you and you need to return.
  4. 10. you read it and then you know how to use
Down
  1. 1. make bad things good
  2. 2. e-book
  3. 3. www.baidu.com
  4. 4. you don't have sth but your friend have, then you can get it from your friend.
  5. 5. buy and sell
  6. 6. inventions,machines
  7. 7. one of 4 greatest inventions in China