IF THERE ... GRAVITY, WATER WOULDN'T RUN DOWN HILL.A. AREN'T B. IS...
49. If there ... gravity, water wouldn't run down hill.
A. aren't
B. isn't
C. wasn't
D. weren't
49. If there ... gravity, water wouldn't run down hill.
A. aren't
B. isn't
C. wasn't
D. weren't