阅读下面的材料并填空。有的答案要填入适当的内容，有的答案要用括号内单词的正确形式，但每个答案不多于三个单词。

Do you know Stonehenge? It’s one of Britain’s most famous historical ___(1)___ (place). Every year more than 750, 000 people ___(2)___ (visit) it. People like to go to this place as they want to see the sun ___(3)___ (rise) on the longest day of the year, especially ___(4)___ June.

Different people have different ideas about Stonehenge. Some historians believed Stonehenge was a temple, ___(5)___ historian Paul Stoker thinks this can’t be true because Stonehenge was built many centuries ago. Other people believe the stones were used to keep people ___(6)___ (health). No one is sure ___(7)___ Stonehenge was used for, but most agree that the position of the stones must be for a special purpose. People might build it ___(8)___ (respect) ancestors.

Stonehenge was built ___(9)___ (slow) over a long period of time. Most historians believe it must be almost 5,000 years old. The stones are so big and heavy ___(10)___ no one knows how it was built, but we do know the builders must have been hard-working and great planners.