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閱讀下面材料，在空白處填入適當的內容（1個單詞）或括號內單詞的正確形式。

One sentence from the news in Washington has remained in my mind since a trip last summer: “When you see people run against the crowd escaping 1. the danger, they are 2. (probable) firefighters, police or journalists.”

I think this is most true for the firefighters. Whenever and wherever 3. (disaster) happen — 9/11 Attacks in New York 14 years ago or the explosion in Tianjin on Wednesday night — it is always the firefighters 4. take the lead to run to the very center, saving lives by 5. (risk) their own. I cried today near the explosion site, not because of the smoke from the ongoing fire 6. because of a short message a firefighter sent to a trusted friend that went viral online. It reads, “If I cannot make it, my father is 7. (you) father; and please remember 8. (sweep) my mother’s tomb.” I was thrilled later to learn that he did make it.

“Everyone knows it’s 9. (danger) to be a firefighter. But he has always liked it and has done it for 12 years,” his father said. “He survived this time, but no one knows what 10. (happen) next time.”

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根據短文內容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。

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The Celerifere, an early version of the bicycle, was built around 1791 by a French man, Comte Mede de Sivrac. It was basically a scooter with a high seat. There were no pedals---you had to push with your feet like you do with a skateboard or a scooter.

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