22. You should clean your teeth with floss _______________ there is a connection between your dental health and your heart. (A) unless (B) because (C) otherwise (D) likewise

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

22. You should clean your teeth with floss _______________ there is a connection between your dental health and your heart.
(A) unless
(B) because
(C) otherwise
(D) likewise

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