In 1930 we laughed on average for 19 minutes each day, but by 1980 it ______ to six minutes.
(A) has been decreasing (B) was decreasing (C) should have decreased (D) had decreased
After working in front of my computer for the entire day, my neck and shoulders got so _______ that I couldn’t even turn my head.
(A) dense (B) harsh (C) stiff (D) concrete
3 Several reviewers considered Cooper’s study to be well-designed and well-conducted, while others remained
_____about some of the data used in the study.
(A) ambitious (B) evasive (C) pessimistic (D) skeptical