Jumbled up sentencesI. only / compete /Before / the / amateurs / could / in / Olympic Games / 1988.II. watched / people

I. Before 1988 only amateurs could compete in the Olympic Games . II. Over 3.5 billion people watched the Sydney Olympics on television. III. More than eleven thousand competitors took part in the Sydney Summer Olympics in 2004 . IV. The large number of people who take part makes it difficult and expensive for host cities to organize the Olympics.