The rapid rise in the global population is not expected to start until past the middle of this century, by which time it will have reached 9 billion. A. falling off B. knocking down C. loo
The rapid rise in the global population is not expected to start ____ until past the middle of this century, by which time it will have reached 9 billion.
A. falling off
B. knocking down
C. looking over
D. passing out