A. alarm B. alert C. warning D. notice

　　18. Although his people did not _____ his efforts, he kept trying.

　　A. agree with B. apply to C. approve of D. consent with

　　19. Picasso's _____ ability was apparent in his early youth when he started drawing sketches.

　　A. writing B. artistic C. reasoning D. literary

　　20. We hope that the measures to control prices, _____ taken by the government, will succeed.

　　A. when B. since C. after D. as