閱讀下面材料，在空白處填入適當?shù)膬?nèi)容（1個單詞）或括號內(nèi)單詞的正確形式。

A triathlon(三項全能運動) is a sports event which combines three sports,1. (typical) running, biking, and swimming. During a triathlon, athletes finish all three sports without stopping 2. (beat) the clock. People of all ages and sizes can compete in triathlons. But much like other sports events, a lot of professional 3. (compete) rule the triathlon world. In addition, many triathlon 4. (hold) to benefit charity, much like marathons.

The modern triathlon appeared in California in 5. 1970s. It usually begins with the swimming, 6. (follow) by cycling, and finally running. A triathlon tests the endurance(忍耐力) and speed of an athlete, as well as his or her ability to keep energy and focus 7. the race as a whole. A triathlon competes against a clock, rather than against other athletes. A variation of the triathlon is a relay triathlon, 8. a different athlete completes each stage.

The swimming stage takes place in a lake or the open ocean. As soon as athletes come out from the water, they change into cycling at the 9. (fast) speed to save time. After cycling, the athletes change shoes to run. The course is considered complete once the athletes 10. (cross) the finish line.

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When milk arrived on the doorstep

When I was a boy growing up in New Jersey in the 1960s, we had a milkman delivering milk to our doorstep. His name was Mr.Basille. He wore a white cap and drove a white truck. As a 5-year-old boy, I couldn’t take my eyes off the coin changer fixed to his belt. He noticed this one day during a delivery and gave me a quarter out of his coin changer.

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