20.　 It was about 8 years after Hong Kong’s ________ ( 回归 ) to China.</SP

19.　 Do you know how long it has been in _______ ( 服务 ) ?

18.　 China has changed a lot ______ ( 在……期间 ) the past 40 years.

17.　 There is much ______ ( 开阔的 ) space in the west of China.

16.　 We lived together until 1960 when I got _______ ( 结婚 ).

15.　 It is _______ ( 幸运 ) for us to catch the early bus .

14.　 The old man lives alone, but he never feel _______ ( 孤独的 ).

13.　 If your homework is ________ ( 完整的 ), you can’t go fishing.

12.　 It’s _______ ( 礼貌 ) to talk loudly in the library.

11.　 There is a lot of _______ ( 新鲜的 ) air in the forest.