Tennis
Beach Volleyball.
womens boxing
soccer soccer
Wrestling is a Summer Olympics sport.
Croquet?? Not really sure, just a guess
At the 2008 Games, that would be softball.
Yes, basketball has been played in the Summer Olympic Games since 1936 and was also played as a demonstration sport in the 1904 Games.
snowboarding
Yes.
Gymnastics is a summer Olympics sport not a winter Olympics sport. Gymnastics will next be in the London Olympics in 2012 and the Rio Olympics in 2016.
the IOC has decided to put a limit on the number of sports, as well as events and athletes, in the Summer Olympics in order not to increase them from the 28 sports, 300 events and 10,000 athletes of the 2000 Summer Olympics.
Golf and Rugby will be the newest Olympic sport at the summer Olympics in London in 2012.