题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Kip Keno, an untrained Randi tribesman, was already 28 years old, 1. he made his second Olympic appearance at the 1968 Mexico City Games. Suffering from violent stomach 2. (cause) by a gall bladder infection, Keno entered the 10,000 m. He was running with the leaders when, with two 3.(circle) to go, he doubled up with pain and fell onto the field. He jumped back up and finished the race, 4. he was canceled qualification for leaving the track.

Four days later, he earned a silver medal in the 5,000 m, 5. (leave) behind Mohamed Gammon of Tunisia by narrowly a metre. In the 1,500 m, Keno tried to defeat the finishing kick of the favourite, Jim Ryan, by building up a huge lead. His strategy worked and he 6. (win) by 20 m, the 7.(large) advantage of victory in the history of the event.

In 1972, Keno entered the steeplechase (障碍赛) even though he had little experience in 8.event. Still, he was able 9.( defeat) teammate Ben Jericho and won another gold medal. Six days after this victory, he added a silver medal in the 1,500 m, winning a good medal.

Keno and his wife, Phyllis,10. (eventual) established a children's home and school for orphaned and abandoned children.