1.   Until last year, Boston had hosted the summer MacWorld for years.

2.   The outbreak of the parasites giardia and cryptosporidium has been an international embarrassment to the city that will host the summer Olympics in two years.

3.   The outbreak of the parasites giardia and cryptosporidium, has been an international embarrassment to the city that will host the summer Olympics in two years.

4.   The United Nations has welcomed the idea of calling for cease-fires in war zones around the world when Athens hosts the next summer Olympics.

5.   In addition discussing to political and economic issues, the two countries are to compare notes on hosting the summer Olympic Games.

6.   The two countries are to compare notes on hosting the summer Olympic Games.