23. The tsunami caused by an earthquake in Japan _______________ has received attention worldwide. (A) lately (B) periodically (C) early (D) frequently

29. Scientists had warned the people in Armero of the dangers of volcano, but most people had forgotten about them. The volcano erupted in 1985 and killed hundreds of people there. If the scientists’ warnings _______________, many lives could have been saved. (A) had not been ignored (B) have not ignored (C) were not ignored (D) have not been ignoring

23. The tsunami caused by an earthquake in Japan _______________ has received attention worldwide.
(A) lately
(B) periodically
(C) early
(D) frequently

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