30. It is the sixth month ______ in which exports have fallen because of the economy crisis.

　 A. in a row　　　　 B. in total　　　　　 C. in all　　　　　 D. in order

29. I don’t think Peter is too young to take care of the pet dog ______.

　 A. correctly　　　　 B. properly　　　　 C. exactly 　　　　D. actively

28. The presentation, management, and outcome of mental disorder differ between ethnic groups, so experts suggest delivering mental health services for a ______ society.

　 A. bureaucratic　　　 B. diverse　　　　 C. conventional　　 D. primitive