17.　 It’s a pleasant way to help keep our environment clean and tidy.

16.　 Whenever some one throws in some rubbish, it produces a piece of music.

15.　 Do you thing Greener China can do something?

14.　 You give it your best shot.

13.　 His teacher, Mr. Feng, spoke highly of his student.

12.　 Then he slowed down as the wind became stronger and the waves higher.

11.　 Have you just been to the computer room.

10.　 He has been in Honolulu ever since.

9.　　 For example, Jack Booth, a 21-year-old man, gave up his job in the San Francisco library a year ago.

8.　　 They surf three times a day if possible, in both winter and summer.