9. sprinkled 10. by accident 11. discovered, thousand

5. by mistake　 6. thin　 7. in the end　 8. salty

1. invented　 2. invented 3. is used for 4. annoying

20.　 Can you _______ the computer? (操作)

Sample answers:

19.　 Here is a ________ present for you. (特别的)

18.　 Many young people _____ _____ (梦想) becoming famous basketball players.

17.　 Dr Naismith _______ (创造) a game to be played on a hard wooden floor.

16.　 Dr Naismith ______ (分) the men in his class into two teams.

15.　 The emperor ______ (发现) that the leaves in the water _______ (发出) a pleasant smell.

14.　 She ______ beautiful after these years. (保持)