Scientists have made a major _____________in the treatment of cancer. A: eakdown B: eakthrough C: efficiency

There has been a marked increase in industrial ____ during the past ten years. A: takeove B: output C: eakthrough D: cutback

China achieved a marvelous _______ at the 15th Asian Games, _______ first in the gold medal count with 165 gold medals. A: eakthrough; ranking B: progress; ranked C: goal; has ranked D: improvement; to rank