19.　　 dark a. –darkness n.

[s] carelessness, sickness, happiness, kindness, lightness, brightness, illness

18.　　 crime n. – criminal a.

17.　　 create v. – creation n. – creator n. – creativity n. – creative a.　 creature n.

16.　　 contribution n. – contribute v.

15.　　 conclude v. – conclusion n.

14.　　 complain v. –complaint n.

13.　　 compete v. –competition n.　　 competitive　 a.

12.　　 common a. – commonly ad.

11.　　 city n. – citizen n. – 　citizenship n.公民资格

10.　　 celebrate v. – celebration n.