Fill each of the numbered blanks in the following passage.

Use only one word in each space was problem children example It Population growth is a serious (1)........... around the world. At the beginning of the 20th century, there were about 1.5 billion people in the world. In 1984 the world population (2).......... 4.8 billion people. By the year 2000, .(3)…… will be about 6.1 billion. This growth in population is not happening everywhere. For (4)……. in Europe the population is not growing at all families in these countries are smaller now. Only about 2.1 (5)...........are born for every woman.

Population growth is a serious (1)........... around the world.