29. give up one’s bad habits　

27. break the habit of doing

28quit doing　

26. get out of the habit of doing

24. with respect　　　 25. stay away from

23. a cure for Aids　

21. at risk 22. the key to doing　　　

20. have access to　

18. in addition(to) 19. be involved in　

17. up-to-date technology　　　

15. apart from 16. devote …to …