Choose the best answer A, B, C or D to compete the following passage.
In some countries there is negative population growth, which means that the population (21)_______, especially in Central and Eastern Europe, mainly due to low birth rates, and Southern Africa due to the high number of HIV-related deaths. Within the next decade, Japan and Western Europe are also (22)_______to encounter negative population growth due to sub-replacement fertility rates.
Population growth which exceeds the carrying capacity of an area or environment (23)_______in overpopulation. Conversely, such areas may be considered “underpopulated” if the population is not large (24)_______to maintain an economic system. The future of world’s population could be significantly affected by the worldwide HIV/AIDS pandemic. In Africa, birth rates are already the highest in the world, especially in sub-Sahara Africa. But if HIV/AIDS is controlled or even eradicated, the world’s population could increase (25)_______faster than predicated.
(21)______
A.increases
B.grows
C.raises
D.decreases

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