閱讀下面材料，在空白處填入適當?shù)膬?nèi)容（不多于3個單詞）或括號內(nèi)單詞的正確形式。

Imagine falling towards the planet Earth at 1. awesome speed of 300 kilometers per hour. You start your fall from over four kilometers above the Earth. And you have less than one minute before you pull your parachute (降落傘）cord. You are falling 2. fast that just turning your head can send you off 3. a different direction. This is the wild side of a sport that has not found its limit—freeflying.

Freeflying 4. (base) on the more traditional skydiving, 5. of which are eye-catching. However, it is more terrifying to watch freeflyers create formations and movements. Freeflyers, 6. the name suggests, enjoy the more spontaneous(即興的）thrill of doing their own things.

The wildest trip for a freeflyers is falling ‘head down’. Falling ‘head first’ requires a great deal of control, which means 7. (travel) not only fast but also steadily. Even the 8. (slight) movement has a great effect on your direction.

They wear the amusing jumpsuits, strange helmets and smaller parachutes. 9. (actual), their parachutes are about one quarter the size of the traditional skydiver’s parachutes. It is only in the last few years 10. freeflying has gained any real public acceptance.

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