17.　　 import --- export (n. / v.)　　　

16.　　 high (adj./ adv.) the high jump / jump high

highly ---- speak highly of…

15.　　 complain sth. about sth.

14.　　 thief / thieves (n.) ---- theft (n.)　

13.　　 breath (n.) ---- breathe (vi)

12.　　 heavy ---- (snow / rain) heavily / hard

(wind) strong / strongly

11.　　 several +可名复

10.　　 break (broke / broken) into…

9.　　　 enemy

8.　　　 add